raceindex.org
Explore
Explore RaceIndex

Find your race. Make your plan.

Find a race

Choose your distance and destination.

Compare courses

See what changes from race to race.

Enter and prepare

Turn your choice into a race plan.

Race weekend

Plan travel, support and the finish.

Your next goal

Find a race that fits your experience.

Find a race
Compare courses
Enter and prepare
Race weekend
Your next goal
My Season Save races, keep preparation tasks and plan what comes next.
About RaceIndexOur methodologyData coverageCyclingTriathlon

Flattest 10ks

The flattest 10ks, ranked from trusted raw-elevation route profiles across 111 qualifying races.

Ranking current as of

Which race ranks first — and why is it Naturosa Catania Marathon?

Naturosa Catania Marathon leads this ranking on flat grade share (100.0%).

Compare Naturosa Catania Marathon vs Summer Breeze Half Marathon (San Leandro)

#RaceFlat grade shareAscentClimb densityDescentNet elevationMax absolute gradeAs of
1Naturosa Catania Marathon 10K - italy100.0%4 m0.4 m/km4 m-0 m0.7%
2Summer Breeze Half Marathon (San Leandro) 10K - california100.0%0 m0.0 m/km0 m-0 m1.7%
3Vale of York Half Marathon 10K - yorkshire100.0%8 m0.8 m/km8 m-0 m1.0%
4ATW Bedford 10k & Half Marathon - east-of-england99.6%8 m0.8 m/km7 m0 m2.7%
5Zürich Marathon 10K - switzerland99.4%15 m1.5 m/km17 m-2 m2.2%
6Bath & Bristol Railway Races 10K - south-west99.3%7 m0.7 m/km6 m1 m2.6%
7The Woodlands Marathon 10K - texas96.4%20 m2.0 m/km23 m-3 m3.7%
8SwissCityMarathon – Lucerne 10K - switzerland96.3%27 m2.7 m/km31 m-4 m4.1%
9City of Colleges Half Marathon 10K - arkansas95.4%32 m3.2 m/km33 m-0 m2.8%
10Toulouse Métropole Run Experience 10K - france93.5%40 m4.0 m/km50 m-10 m12.6%
11Tirol läuft (Innsbruck) 10K - austria93.4%33 m3.3 m/km35 m-2 m5.6%
12Nagyerdei Terep Maraton (Debrecen) 10K - hungary93.2%29 m2.8 m/km31 m-3 m3.8%
13Martian Invasion of Races 10K - michigan93.0%31 m3.1 m/km31 m0 m5.3%
14TBK Bank Quad Cities Marathon 10K - iowa92.7%29 m2.9 m/km28 m1 m6.4%
15Bear Trail Half Marathon & 10K - delaware92.2%36 m3.6 m/km37 m-0 m4.9%
16Wilmslow Half Marathon 10K - north-west91.1%40 m4.0 m/km43 m-3 m3.4%
17Greifenseelauf Uster 10K - switzerland91.1%52 m5.2 m/km34 m18 m9.6%
18Indiana Women's Running Festival (Indy Women's Half Marathon), Carmel 10K - indiana90.9%36 m3.6 m/km36 m-0 m5.5%
19Cleveland Marathon 10K - ohio90.1%46 m4.6 m/km46 m0 m8.1%
20Mein Freiburg Marathon 10K - germany90.0%54 m5.4 m/km52 m2 m6.4%
21The Doncaster City 10K - yorkshire89.9%42 m4.2 m/km41 m0 m5.0%
22Garmin New Forest Marathon 10K - south-east89.0%40 m4.0 m/km41 m-2 m6.3%
23Ukrop's Monument Avenue 10K (Richmond) - virginia87.9%49 m4.9 m/km43 m6 m5.9%
24Montana Marathon (Billings) 10K - montana87.8%13 m1.3 m/km64 m-51 m4.0%
25Paavo Nurmi Marathon 10K - finland87.1%42 m4.2 m/km42 m-1 m5.7%
26Debrecen Maraton 10K - hungary86.7%46 m4.4 m/km46 m0 m5.5%
27Garmin Olathe Marathon in the Land of Oz 10K - kansas86.5%55 m5.5 m/km55 m0 m5.0%
28Madison Marathon (Madison, Wisconsin) 10K - wisconsin86.0%43 m4.3 m/km38 m4 m6.2%
29Parkway Subaru Battleship Half Marathon & GFL 10K|5K (Wilmington) - north-carolina85.2%52 m5.2 m/km52 m0 m7.6%
30Reims Champagne Run 10K - france84.5%47 m4.7 m/km49 m-2 m4.5%
31The Original Las Vegas Marathon 10K - nevada84.5%55 m5.5 m/km56 m-0 m3.3%
32Naisten Kymppi (Helsinki) 10K - finland84.1%48 m4.8 m/km47 m1 m6.4%
33NN Night Run Ostrava 10K - czechia83.7%51 m5.1 m/km54 m-3 m4.9%
34Trondheim Maraton 10K - norway83.4%51 m5.1 m/km51 m1 m9.0%
35Helvetia Half Marathon 10K - oregon83.1%51 m5.1 m/km49 m2 m5.4%
36Marathon Vert Rennes 10K - france80.6%56 m5.6 m/km55 m1 m7.2%
37Cajun Country Run 10K - louisiana80.0%61 m6.1 m/km61 m-0 m10.7%
38Naptown Half Marathon & 10K/5K - maryland79.8%63 m6.3 m/km63 m-0 m9.3%
39Chester Marathon 10K - north-west79.5%60 m6.0 m/km50 m11 m6.2%
40Bozeman Half Marathon & 10K - montana78.8%17 m1.7 m/km121 m-104 m4.0%
41Run Leicester 10K - east-midlands77.5%63 m6.3 m/km63 m-0 m5.6%
42Regeneron Great Limerick Run 10K - ireland77.4%55 m5.7 m/km58 m-3 m5.4%
43Etape Bornholm 10K - denmark77.0%56 m5.6 m/km62 m-6 m9.9%
44Southampton Marathon 10K - south-east76.8%70 m7.0 m/km56 m14 m13.8%
45Windermere Marathon (Spokane) 10K - washington76.3%62 m6.2 m/km62 m0 m5.0%
46Bend Marathon and Half 10K - oregon76.0%68 m6.8 m/km68 m0 m10.2%
47Lundaloppet 10K - sweden75.4%72 m7.2 m/km69 m3 m7.5%
48BTC Vulcan Run 10K (Birmingham) - alabama73.7%84 m8.4 m/km84 m-0 m20.5%
49Lift Bridge Road Races 10K - minnesota73.6%84 m8.4 m/km55 m29 m12.9%
50Athens Marathon. The Authentic 10K - greece73.1%79 m7.9 m/km83 m-4 m4.4%
51Montpellier Run Festival 10K - france71.6%94 m9.4 m/km82 m12 m9.9%
52Flying Pig Marathon 10K - ohio71.5%82 m8.2 m/km83 m-1 m10.4%
53Fayetteville Half Marathon 10K - arkansas71.4%82 m8.2 m/km82 m0 m10.6%
54Rimi Riga Marathon 10K - latvia71.3%85 m8.5 m/km84 m1 m19.7%
55OhioHealth Capital City Half & Quarter Marathon (Columbus) 10K - ohio71.0%104 m9.8 m/km102 m1 m20.2%
56Courses de Strasbourg Eurométropole 10K - france70.7%89 m8.9 m/km83 m6 m12.9%
57St. Croix Crossing Half Marathon 10K - minnesota70.6%23 m2.3 m/km91 m-68 m10.4%
58Bay of Fundy International Marathon 10K - maine69.9%64 m6.4 m/km91 m-27 m9.1%
59Cedar Rapids Marathon 10K - iowa69.8%85 m8.5 m/km86 m-0 m13.8%
60Clonakilty Waterfront Marathon 10K - ireland69.5%89 m8.9 m/km94 m-4 m12.3%
61Thames Meander Marathon (London) 10K - london68.7%78 m7.8 m/km77 m0 m6.5%
62Ultra Trail Vipava Valley (UTVV), Ajdovščina 10K - slovenia67.5%110 m11.0 m/km110 m1 m14.5%
63Altru Family YMCA Firecracker 5K & 10K Fun Run/Walk - north-dakota67.5%79 m7.9 m/km79 m-0 m8.8%
64Garstang 10K - north-west65.3%80 m8.0 m/km81 m-1 m5.8%
65Run Madtown Half Marathon, 10K & 5K - wisconsin64.7%101 m10.1 m/km100 m1 m10.8%
66OTC Butte to Butte (Eugene) 10K - oregon64.6%99 m9.9 m/km133 m-34 m11.8%
67Zurich Rock 'n' Roll Running Series Madrid 10K - spain64.3%66 m6.6 m/km93 m-26 m7.7%
68Phoenix 10k & Half Marathon - arizona63.2%93 m9.3 m/km93 m0 m7.3%
69Endurancelife Suffolk (Dunwich) 10K - east-of-england62.6%88 m9.0 m/km89 m-1 m9.1%
70Generali Genève Marathon 10K - switzerland59.4%81 m8.1 m/km129 m-48 m11.6%
71Gravel Worlds Run Series (Lincoln) 10K - nebraska59.0%90 m9.0 m/km90 m0 m6.7%
72LIDL São Silvestre de Lisboa 10K - portugal58.2%119 m11.9 m/km119 m0 m13.6%
73St Albans Half Marathon 10K - east-of-england56.8%97 m9.7 m/km97 m0 m6.9%
74La Jolla Half Marathon, 10K & 5K - california56.0%76 m7.6 m/km197 m-121 m12.4%
75Statesman Cap10K (Austin) 10K - texas55.3%152 m15.2 m/km159 m-7 m22.6%
76Haulin' Aspen Trail Race 10K - oregon54.7%130 m12.4 m/km155 m-25 m10.9%
77The Skippo Trail Race 10K - missouri54.1%155 m15.5 m/km155 m0 m19.9%
78Middlebury Maple Run 10K - vermont54.0%116 m11.6 m/km116 m-0 m11.3%
79RAD Half Marathon & 10K (Asheville) - north-carolina50.8%92 m9.2 m/km163 m-72 m10.3%
80Run the Rainbow for Children's 10K - mississippi50.2%117 m11.7 m/km117 m0 m8.3%
81DNB Oslo Marathon 10K - norway49.8%128 m12.8 m/km130 m-2 m13.3%
82Acadia Half Marathon & 10K - maine49.0%135 m13.5 m/km139 m-4 m16.0%
83SPAR Budapest Marathon 10K - hungary48.5%152 m15.2 m/km152 m-0 m18.7%
84Greene & Schultz Hoosier Half Marathon, 5 & 10K - indiana47.6%134 m13.4 m/km134 m0 m16.3%
85TARC Stone Cat Trail Festival 10K - massachusetts46.7%155 m15.5 m/km155 m0 m17.5%
86Spring Dash (Coeur d'Alene) 10K - idaho46.6%148 m14.8 m/km147 m1 m14.6%
87Juneteenth Half Marathon & 10K (Washington DC) - dc46.0%134 m13.4 m/km198 m-64 m15.7%
88Norfolk Festival of Running (King's Lynn) 10K - east-of-england45.5%139 m13.9 m/km139 m-1 m9.8%
89Konza 25K & 10K (Manhattan) - kansas45.4%148 m14.8 m/km145 m4 m15.5%
90Isle of Skye Half Marathon 10K - scotland42.9%112 m11.2 m/km144 m-31 m9.9%
91Double Decker Spring Run (Oxford, MS) 10K - mississippi42.8%138 m13.8 m/km138 m-0 m11.1%
92Spokane River Run 10K - washington42.4%152 m15.2 m/km152 m0 m17.2%
93Portland Coastal Marathon 10K - south-west39.6%207 m20.7 m/km208 m-0 m22.0%
94Two Tunnels Railway Races 10K - south-west39.0%244 m24.4 m/km241 m2 m18.1%
95TCS Lidingöloppet 10K - sweden36.0%162 m16.2 m/km159 m3 m12.4%
96Lakeland Trails Coniston Marathon, Half, Mini-10k & 5k - north-west33.1%318 m31.8 m/km317 m0 m24.6%
97The Maverick Peak District Trail (Bakewell) 10K - east-midlands32.1%256 m25.6 m/km256 m0 m26.0%
98Trondheim Skogsmaraton 10K - norway32.0%232 m22.1 m/km232 m-0 m19.4%
99Tollymore Extreme (Tollymore Trail Marathon), Newcastle 10K - northern-ireland31.8%189 m18.9 m/km187 m2 m16.1%
1006 sjöar (Uppsala) 10K - sweden30.8%222 m21.5 m/km231 m-9 m26.1%
1
Naturosa Catania Marathon 10Kitaly
Flat grade share
100.0%
Ascent
4 m
Climb density
0.4 m/km
Descent
4 m
Net elevation
-0 m
Max absolute grade
0.7%

As of

3
Vale of York Half Marathon 10Kyorkshire
Flat grade share
100.0%
Ascent
8 m
Climb density
0.8 m/km
Descent
8 m
Net elevation
-0 m
Max absolute grade
1.0%

As of

4
ATW Bedford 10k & Half Marathoneast-of-england
Flat grade share
99.6%
Ascent
8 m
Climb density
0.8 m/km
Descent
7 m
Net elevation
0 m
Max absolute grade
2.7%

As of

5
Zürich Marathon 10Kswitzerland
Flat grade share
99.4%
Ascent
15 m
Climb density
1.5 m/km
Descent
17 m
Net elevation
-2 m
Max absolute grade
2.2%

As of

7
The Woodlands Marathon 10Ktexas
Flat grade share
96.4%
Ascent
20 m
Climb density
2.0 m/km
Descent
23 m
Net elevation
-3 m
Max absolute grade
3.7%

As of

11
Tirol läuft (Innsbruck) 10Kaustria
Flat grade share
93.4%
Ascent
33 m
Climb density
3.3 m/km
Descent
35 m
Net elevation
-2 m
Max absolute grade
5.6%

As of

13
Martian Invasion of Races 10Kmichigan
Flat grade share
93.0%
Ascent
31 m
Climb density
3.1 m/km
Descent
31 m
Net elevation
0 m
Max absolute grade
5.3%

As of

15
Bear Trail Half Marathon & 10Kdelaware
Flat grade share
92.2%
Ascent
36 m
Climb density
3.6 m/km
Descent
37 m
Net elevation
-0 m
Max absolute grade
4.9%

As of

16
Wilmslow Half Marathon 10Knorth-west
Flat grade share
91.1%
Ascent
40 m
Climb density
4.0 m/km
Descent
43 m
Net elevation
-3 m
Max absolute grade
3.4%

As of

17
Greifenseelauf Uster 10Kswitzerland
Flat grade share
91.1%
Ascent
52 m
Climb density
5.2 m/km
Descent
34 m
Net elevation
18 m
Max absolute grade
9.6%

As of

19
Cleveland Marathon 10Kohio
Flat grade share
90.1%
Ascent
46 m
Climb density
4.6 m/km
Descent
46 m
Net elevation
0 m
Max absolute grade
8.1%

As of

20
Mein Freiburg Marathon 10Kgermany
Flat grade share
90.0%
Ascent
54 m
Climb density
5.4 m/km
Descent
52 m
Net elevation
2 m
Max absolute grade
6.4%

As of

21
The Doncaster City 10Kyorkshire
Flat grade share
89.9%
Ascent
42 m
Climb density
4.2 m/km
Descent
41 m
Net elevation
0 m
Max absolute grade
5.0%

As of

22
Garmin New Forest Marathon 10Ksouth-east
Flat grade share
89.0%
Ascent
40 m
Climb density
4.0 m/km
Descent
41 m
Net elevation
-2 m
Max absolute grade
6.3%

As of

24
Montana Marathon (Billings) 10Kmontana
Flat grade share
87.8%
Ascent
13 m
Climb density
1.3 m/km
Descent
64 m
Net elevation
-51 m
Max absolute grade
4.0%

As of

25
Paavo Nurmi Marathon 10Kfinland
Flat grade share
87.1%
Ascent
42 m
Climb density
4.2 m/km
Descent
42 m
Net elevation
-1 m
Max absolute grade
5.7%

As of

26
Debrecen Maraton 10Khungary
Flat grade share
86.7%
Ascent
46 m
Climb density
4.4 m/km
Descent
46 m
Net elevation
0 m
Max absolute grade
5.5%

As of

30
Reims Champagne Run 10Kfrance
Flat grade share
84.5%
Ascent
47 m
Climb density
4.7 m/km
Descent
49 m
Net elevation
-2 m
Max absolute grade
4.5%

As of

32
Naisten Kymppi (Helsinki) 10Kfinland
Flat grade share
84.1%
Ascent
48 m
Climb density
4.8 m/km
Descent
47 m
Net elevation
1 m
Max absolute grade
6.4%

As of

33
NN Night Run Ostrava 10Kczechia
Flat grade share
83.7%
Ascent
51 m
Climb density
5.1 m/km
Descent
54 m
Net elevation
-3 m
Max absolute grade
4.9%

As of

34
Trondheim Maraton 10Knorway
Flat grade share
83.4%
Ascent
51 m
Climb density
5.1 m/km
Descent
51 m
Net elevation
1 m
Max absolute grade
9.0%

As of

35
Helvetia Half Marathon 10Koregon
Flat grade share
83.1%
Ascent
51 m
Climb density
5.1 m/km
Descent
49 m
Net elevation
2 m
Max absolute grade
5.4%

As of

36
Marathon Vert Rennes 10Kfrance
Flat grade share
80.6%
Ascent
56 m
Climb density
5.6 m/km
Descent
55 m
Net elevation
1 m
Max absolute grade
7.2%

As of

37
Cajun Country Run 10Klouisiana
Flat grade share
80.0%
Ascent
61 m
Climb density
6.1 m/km
Descent
61 m
Net elevation
-0 m
Max absolute grade
10.7%

As of

38
Naptown Half Marathon & 10K/5Kmaryland
Flat grade share
79.8%
Ascent
63 m
Climb density
6.3 m/km
Descent
63 m
Net elevation
-0 m
Max absolute grade
9.3%

As of

39
Chester Marathon 10Knorth-west
Flat grade share
79.5%
Ascent
60 m
Climb density
6.0 m/km
Descent
50 m
Net elevation
11 m
Max absolute grade
6.2%

As of

40
Bozeman Half Marathon & 10Kmontana
Flat grade share
78.8%
Ascent
17 m
Climb density
1.7 m/km
Descent
121 m
Net elevation
-104 m
Max absolute grade
4.0%

As of

41
Run Leicester 10Keast-midlands
Flat grade share
77.5%
Ascent
63 m
Climb density
6.3 m/km
Descent
63 m
Net elevation
-0 m
Max absolute grade
5.6%

As of

43
Etape Bornholm 10Kdenmark
Flat grade share
77.0%
Ascent
56 m
Climb density
5.6 m/km
Descent
62 m
Net elevation
-6 m
Max absolute grade
9.9%

As of

44
Southampton Marathon 10Ksouth-east
Flat grade share
76.8%
Ascent
70 m
Climb density
7.0 m/km
Descent
56 m
Net elevation
14 m
Max absolute grade
13.8%

As of

46
Bend Marathon and Half 10Koregon
Flat grade share
76.0%
Ascent
68 m
Climb density
6.8 m/km
Descent
68 m
Net elevation
0 m
Max absolute grade
10.2%

As of

47
Lundaloppet 10Ksweden
Flat grade share
75.4%
Ascent
72 m
Climb density
7.2 m/km
Descent
69 m
Net elevation
3 m
Max absolute grade
7.5%

As of

48
BTC Vulcan Run 10K (Birmingham)alabama
Flat grade share
73.7%
Ascent
84 m
Climb density
8.4 m/km
Descent
84 m
Net elevation
-0 m
Max absolute grade
20.5%

As of

49
Lift Bridge Road Races 10Kminnesota
Flat grade share
73.6%
Ascent
84 m
Climb density
8.4 m/km
Descent
55 m
Net elevation
29 m
Max absolute grade
12.9%

As of

51
Montpellier Run Festival 10Kfrance
Flat grade share
71.6%
Ascent
94 m
Climb density
9.4 m/km
Descent
82 m
Net elevation
12 m
Max absolute grade
9.9%

As of

52
Flying Pig Marathon 10Kohio
Flat grade share
71.5%
Ascent
82 m
Climb density
8.2 m/km
Descent
83 m
Net elevation
-1 m
Max absolute grade
10.4%

As of

53
Fayetteville Half Marathon 10Karkansas
Flat grade share
71.4%
Ascent
82 m
Climb density
8.2 m/km
Descent
82 m
Net elevation
0 m
Max absolute grade
10.6%

As of

54
Rimi Riga Marathon 10Klatvia
Flat grade share
71.3%
Ascent
85 m
Climb density
8.5 m/km
Descent
84 m
Net elevation
1 m
Max absolute grade
19.7%

As of

59
Cedar Rapids Marathon 10Kiowa
Flat grade share
69.8%
Ascent
85 m
Climb density
8.5 m/km
Descent
86 m
Net elevation
-0 m
Max absolute grade
13.8%

As of

64
Garstang 10Knorth-west
Flat grade share
65.3%
Ascent
80 m
Climb density
8.0 m/km
Descent
81 m
Net elevation
-1 m
Max absolute grade
5.8%

As of

66
OTC Butte to Butte (Eugene) 10Koregon
Flat grade share
64.6%
Ascent
99 m
Climb density
9.9 m/km
Descent
133 m
Net elevation
-34 m
Max absolute grade
11.8%

As of

68
Phoenix 10k & Half Marathonarizona
Flat grade share
63.2%
Ascent
93 m
Climb density
9.3 m/km
Descent
93 m
Net elevation
0 m
Max absolute grade
7.3%

As of

70
Generali Genève Marathon 10Kswitzerland
Flat grade share
59.4%
Ascent
81 m
Climb density
8.1 m/km
Descent
129 m
Net elevation
-48 m
Max absolute grade
11.6%

As of

73
St Albans Half Marathon 10Keast-of-england
Flat grade share
56.8%
Ascent
97 m
Climb density
9.7 m/km
Descent
97 m
Net elevation
0 m
Max absolute grade
6.9%

As of

74
La Jolla Half Marathon, 10K & 5Kcalifornia
Flat grade share
56.0%
Ascent
76 m
Climb density
7.6 m/km
Descent
197 m
Net elevation
-121 m
Max absolute grade
12.4%

As of

75
Statesman Cap10K (Austin) 10Ktexas
Flat grade share
55.3%
Ascent
152 m
Climb density
15.2 m/km
Descent
159 m
Net elevation
-7 m
Max absolute grade
22.6%

As of

76
Haulin' Aspen Trail Race 10Koregon
Flat grade share
54.7%
Ascent
130 m
Climb density
12.4 m/km
Descent
155 m
Net elevation
-25 m
Max absolute grade
10.9%

As of

77
The Skippo Trail Race 10Kmissouri
Flat grade share
54.1%
Ascent
155 m
Climb density
15.5 m/km
Descent
155 m
Net elevation
0 m
Max absolute grade
19.9%

As of

78
Middlebury Maple Run 10Kvermont
Flat grade share
54.0%
Ascent
116 m
Climb density
11.6 m/km
Descent
116 m
Net elevation
-0 m
Max absolute grade
11.3%

As of

81
DNB Oslo Marathon 10Knorway
Flat grade share
49.8%
Ascent
128 m
Climb density
12.8 m/km
Descent
130 m
Net elevation
-2 m
Max absolute grade
13.3%

As of

82
Acadia Half Marathon & 10Kmaine
Flat grade share
49.0%
Ascent
135 m
Climb density
13.5 m/km
Descent
139 m
Net elevation
-4 m
Max absolute grade
16.0%

As of

83
SPAR Budapest Marathon 10Khungary
Flat grade share
48.5%
Ascent
152 m
Climb density
15.2 m/km
Descent
152 m
Net elevation
-0 m
Max absolute grade
18.7%

As of

85
TARC Stone Cat Trail Festival 10Kmassachusetts
Flat grade share
46.7%
Ascent
155 m
Climb density
15.5 m/km
Descent
155 m
Net elevation
0 m
Max absolute grade
17.5%

As of

86
Spring Dash (Coeur d'Alene) 10Kidaho
Flat grade share
46.6%
Ascent
148 m
Climb density
14.8 m/km
Descent
147 m
Net elevation
1 m
Max absolute grade
14.6%

As of

89
Konza 25K & 10K (Manhattan)kansas
Flat grade share
45.4%
Ascent
148 m
Climb density
14.8 m/km
Descent
145 m
Net elevation
4 m
Max absolute grade
15.5%

As of

90
Isle of Skye Half Marathon 10Kscotland
Flat grade share
42.9%
Ascent
112 m
Climb density
11.2 m/km
Descent
144 m
Net elevation
-31 m
Max absolute grade
9.9%

As of

92
Spokane River Run 10Kwashington
Flat grade share
42.4%
Ascent
152 m
Climb density
15.2 m/km
Descent
152 m
Net elevation
0 m
Max absolute grade
17.2%

As of

93
Portland Coastal Marathon 10Ksouth-west
Flat grade share
39.6%
Ascent
207 m
Climb density
20.7 m/km
Descent
208 m
Net elevation
-0 m
Max absolute grade
22.0%

As of

94
Two Tunnels Railway Races 10Ksouth-west
Flat grade share
39.0%
Ascent
244 m
Climb density
24.4 m/km
Descent
241 m
Net elevation
2 m
Max absolute grade
18.1%

As of

95
TCS Lidingöloppet 10Ksweden
Flat grade share
36.0%
Ascent
162 m
Climb density
16.2 m/km
Descent
159 m
Net elevation
3 m
Max absolute grade
12.4%

As of

98
Trondheim Skogsmaraton 10Knorway
Flat grade share
32.0%
Ascent
232 m
Climb density
22.1 m/km
Descent
232 m
Net elevation
-0 m
Max absolute grade
19.4%

As of

100
6 sjöar (Uppsala) 10Ksweden
Flat grade share
30.8%
Ascent
222 m
Climb density
21.5 m/km
Descent
231 m
Net elevation
-9 m
Max absolute grade
26.1%

As of

Showing the top 100 of 111 qualifying races; use the distance catalogue for the full searchable list. Scores are out of 100 when present; route, elevation and cost figures are shown in their natural units.

How we ranked these

Races are ranked by Flat grade share. Score metrics use methodology scoring-methodology-v1.0. Elevation rankings use only trusted raw-elevation course profiles. A ranking is only published when at least five races qualify, so the table is never padded with thin data.

See exactly how each figure is calculated →

Route maps for this ranking

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (113)

Read the full methodology →

Common questions

What is the flattest 10ks?

Naturosa Catania Marathon 10K ranks first by flat grade share, from 111 qualifying races compared under our published methodology.