Norfolk Festival of Running (King's Lynn) 10K vs St Albans Half Marathon 10K

Name: Norfolk Festival of Running (King's Lynn) 10K vs St Albans Half Marathon 10K comparison data
Creator: raceindex.org

Norfolk Festival of Running (King's Lynn) 10K or St Albans Half Marathon 10K — which comes out ahead?

St Albans Half Marathon 10K has the stronger available profile on flat grade share, course flatness and conditions.

Route comparison snapshot

Norfolk Festival of Running (King's Lynn) 10K

Mapped route: Held
Elevation profile: Held
course flatness: 1.5%
flat grade share: 45.5%
lower ascent: 139 m
climbing density: 13.9 m/km
net elevation: -1 m
maximum grade: 9.8%

St Albans Half Marathon 10K

Mapped route: Held
Elevation profile: Held
course flatness: 1.0% Favoured
flat grade share: 56.8% Favoured
lower ascent: 97 m
climbing density: 9.7 m/km
net elevation: 0 m
maximum grade: 6.9%

Head-to-head comparison
Metric	Norfolk Festival of Running (King's Lynn) 10K	St Albans Half Marathon 10K
Flat grade share	45.5%	56.8% ✓
GAP factor (% slower than flat)	1.5%	1.0% ✓
Uphill share	27.3%	21.4%
Steep-up share	6.0%	3.6%
Downhill share	27.3%	21.7%
Total ascent (m)	139 m	97 m
Climbing density (m/km)	13.9 m/km	9.7 m/km
Longest climb length (m)	140 m	1,120 m
Longest climb gain (m)	9 m	37 m
Longest climb average grade	6.3%	3.3%
Total descent (m)	139 m	97 m
Net elevation (m)	-1 m	0 m
Max absolute grade	9.8%	6.9%
Start elevation (m)	18 m	77 m
Finish elevation (m)	17 m	78 m
Value	85/100	Unavailable
Scenic score	65/100 ✓	60/100
Conditions	61/100	73/100 ✓
Entry fee (GBP)	£29	Unavailable
Lowest modelled true cost (GBP)	£159	Unavailable

Only metrics available for at least one side are shown. A ✓ marks the better value for each metric (higher-is-better aware). Scores are out of 100 when available. Ascent, climbing density, max absolute grade and median finish describe course or field context and are not marked as better or worse.

Race facts that change the decision

Race facts comparison
Fact	Norfolk Festival of Running (King's Lynn) 10K	St Albans Half Marathon 10K
Schedule	Exact race date not confirmed. Event weekend starts 2026-07-12 (legacy event-level date).	Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date).
Location	King's Lynn, East Of England	St Albans, East Of England
Actual distance	10 km	10 km
raceindex.org mapped route held	Held	Held
raceindex.org elevation profile held	Held	Held
Course type	Laps	Unavailable
Surface	Trail course over sand, gravel and grass	Unavailable
Terrain	Trail	Trail
Scenery	Parkland, Countryside, Lakeside, Forest	Parkland, Lakeside, Historic, Countryside
Atmosphere	Festival, Community	Community, Festival
Total ascent	139 m	97 m
Climbing density	13.9 m/km	9.7 m/km
Total descent	139 m	97 m
Net elevation	-1 m	0 m
Max absolute grade	9.8%	6.9%
Flat grade share	45.5%	56.8%
GAP factor	1.5%	1.0%
Field cap	Unavailable	2,500
Entry model	Open	Open
Entry fee	£29	Unavailable
Lowest modelled true cost	£159	Unavailable
Cost model origin	National Average	Unavailable

Schedule

Norfolk Festival of Running (King's Lynn) 10K: Exact race date not confirmed. Event weekend starts 2026-07-12 (legacy event-level date).
St Albans Half Marathon 10K: Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date).

Location

Norfolk Festival of Running (King's Lynn) 10K: King's Lynn, East Of England
St Albans Half Marathon 10K: St Albans, East Of England

Actual distance

Norfolk Festival of Running (King's Lynn) 10K: 10 km
St Albans Half Marathon 10K: 10 km

raceindex.org mapped route held

Norfolk Festival of Running (King's Lynn) 10K: Held
St Albans Half Marathon 10K: Held

raceindex.org elevation profile held

Norfolk Festival of Running (King's Lynn) 10K: Held
St Albans Half Marathon 10K: Held

Course type

Norfolk Festival of Running (King's Lynn) 10K: Laps
St Albans Half Marathon 10K: Unavailable

Surface

Norfolk Festival of Running (King's Lynn) 10K: Trail course over sand, gravel and grass
St Albans Half Marathon 10K: Unavailable

Terrain

Norfolk Festival of Running (King's Lynn) 10K: Trail
St Albans Half Marathon 10K: Trail

Scenery

Norfolk Festival of Running (King's Lynn) 10K: Parkland, Countryside, Lakeside, Forest
St Albans Half Marathon 10K: Parkland, Lakeside, Historic, Countryside

Atmosphere

Norfolk Festival of Running (King's Lynn) 10K: Festival, Community
St Albans Half Marathon 10K: Community, Festival

Total ascent

Norfolk Festival of Running (King's Lynn) 10K: 139 m
St Albans Half Marathon 10K: 97 m

Climbing density

Norfolk Festival of Running (King's Lynn) 10K: 13.9 m/km
St Albans Half Marathon 10K: 9.7 m/km

Total descent

Norfolk Festival of Running (King's Lynn) 10K: 139 m
St Albans Half Marathon 10K: 97 m

Net elevation

Norfolk Festival of Running (King's Lynn) 10K: -1 m
St Albans Half Marathon 10K: 0 m

Max absolute grade

Norfolk Festival of Running (King's Lynn) 10K: 9.8%
St Albans Half Marathon 10K: 6.9%

Flat grade share

Norfolk Festival of Running (King's Lynn) 10K: 45.5%
St Albans Half Marathon 10K: 56.8%

GAP factor

Norfolk Festival of Running (King's Lynn) 10K: 1.5%
St Albans Half Marathon 10K: 1.0%

Field cap

Norfolk Festival of Running (King's Lynn) 10K: Unavailable
St Albans Half Marathon 10K: 2,500

Entry model

Norfolk Festival of Running (King's Lynn) 10K: Open
St Albans Half Marathon 10K: Open

Entry fee

Norfolk Festival of Running (King's Lynn) 10K: £29
St Albans Half Marathon 10K: Unavailable

Lowest modelled true cost

Norfolk Festival of Running (King's Lynn) 10K: £159
St Albans Half Marathon 10K: Unavailable

Cost model origin

Norfolk Festival of Running (King's Lynn) 10K: National Average
St Albans Half Marathon 10K: Unavailable

Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.

Common questions

Which is flatter, Norfolk Festival of Running (King's Lynn) 10K or St Albans Half Marathon 10K?

St Albans Half Marathon 10K has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.

Read the full pages

How figures are calculated →

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 2026-07-06.

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (4)

Layer E archive-api.open-meteo.com
Layer B src_derived
Layer A zigzagrunning.co.uk · last check inconclusive on 2026-07-25
Layer A stalbanshalfmarathon.com · last check inconclusive on 2026-07-29

Read the full methodology →

Norfolk Festival of Running (King's Lynn) 10K or St Albans Half Marathon 10K — which comes out ahead?

Route comparison snapshot

Norfolk Festival of Running (King's Lynn) 10K

St Albans Half Marathon 10K

Flat grade share

GAP factor (% slower than flat)

Uphill share

Steep-up share

Downhill share

Total ascent (m)

Climbing density (m/km)

Longest climb length (m)

Longest climb gain (m)

Longest climb average grade

Total descent (m)

Net elevation (m)

Max absolute grade

Start elevation (m)

Finish elevation (m)

Value

Scenic score

Conditions

Entry fee (GBP)

Lowest modelled true cost (GBP)

Race facts that change the decision

Schedule

Location

Actual distance

raceindex.org mapped route held

raceindex.org elevation profile held

Course type

Surface

Terrain

Scenery

Atmosphere

Total ascent

Climbing density

Total descent

Net elevation

Max absolute grade

Flat grade share

GAP factor

Field cap

Entry model

Entry fee

Lowest modelled true cost

Cost model origin

Common questions

Which is flatter, Norfolk Festival of Running (King's Lynn) 10K or St Albans Half Marathon 10K?

Read the full pages