Flat grade share
- Summer Breeze Half Marathon (San Leandro) 10K
- 100.0% Favoured
La Jolla Half Marathon, 10K & 5K vs Summer Breeze Half Marathon (San Leandro) 10K
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofLa Jolla Half Marathon, 10K & 5K or Summer Breeze Half Marathon (San Leandro) 10K — which comes out ahead?
La Jolla Half Marathon, 10K & 5K has the stronger available profile on course flatness, scenery score and conditions.
Route comparison snapshot
La Jolla Half Marathon, 10K & 5K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- -4.5% Favoured
- flat grade share
- 56.0%
- lower ascent
- 76 m
- climbing density
- 7.6 m/km
- net elevation
- -121 m
- maximum grade
- 12.4%
Summer Breeze Half Marathon (San Leandro) 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 0.0%
- flat grade share
- 100.0% Favoured
- lower ascent
- 0 m
- climbing density
- 0.0 m/km
- net elevation
- -0 m
- maximum grade
- 1.7%
| Metric | La Jolla Half Marathon, 10K & 5K | Summer Breeze Half Marathon (San Leandro) 10K |
|---|---|---|
| Flat grade share | 56.0% | 100.0% ✓ |
| GAP factor (% slower than flat) | -4.5% ✓ | 0.0% |
| Uphill share | 11.3% | 0.0% |
| Steep-up share | 1.8% | 0.0% |
| Downhill share | 32.6% | 0.0% |
| Total ascent (m) | 76 m | 0 m |
| Climbing density (m/km) | 7.6 m/km | 0.0 m/km |
| Longest climb length (m) | 630 m | 640 m |
| Longest climb gain (m) | 25 m | 1 m |
| Longest climb average grade | 4.0% | 0.1% |
| Total descent (m) | 197 m | 0 m |
| Net elevation (m) | -121 m | -0 m |
| Max absolute grade | 12.4% | 1.7% |
| Start elevation (m) | 132 m | 2 m |
| Finish elevation (m) | 10 m | 2 m |
| Scenic score | 73/100 ✓ | 57/100 |
| Conditions | 76/100 ✓ | 73/100 |
GAP factor (% slower than flat)
- La Jolla Half Marathon, 10K & 5K
- -4.5% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- La Jolla Half Marathon, 10K & 5K
- 7.6 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)
Scenic score
- La Jolla Half Marathon, 10K & 5K
- 73/100 Favoured
Conditions
- La Jolla Half Marathon, 10K & 5K
- 76/100 Favoured
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
| Fact | La Jolla Half Marathon, 10K & 5K | Summer Breeze Half Marathon (San Leandro) 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2027-05-15 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2026-08-01 (legacy event-level date). |
| Location | La Jolla, San Diego, California | San Leandro, California |
| Actual distance | 10 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Unavailable | Out And Back |
| Surface | Unavailable | Paved bayside trail (Marina Bay Trail / San Leandro Marina shoreline path). |
| Elevation character | Net Downhill | Unavailable |
| Terrain | Road | Trail |
| Scenery | Forest, Coastal, Waterfront, Parkland, City | Coastal, Waterfront, Parkland |
| Atmosphere | Scenic Tour, Destination, Competitive | Community, Scenic Tour |
| Total ascent | 76 m | 0 m |
| Climbing density | 7.6 m/km | 0.0 m/km |
| Total descent | 197 m | 0 m |
| Net elevation | -121 m | -0 m |
| Max absolute grade | 12.4% | 1.7% |
| Flat grade share | 56.0% | 100.0% |
| GAP factor | -4.5% | 0.0% |
| Entry model | Open | Open |
Schedule
- La Jolla Half Marathon, 10K & 5K
Exact race date not confirmed. Event weekend starts 2027-05-15 (legacy event-level date).
- Summer Breeze Half Marathon (San Leandro) 10K
Exact race date not confirmed. Event weekend starts 2026-08-01 (legacy event-level date).
Location
- La Jolla Half Marathon, 10K & 5K
- La Jolla, San Diego, California
- Summer Breeze Half Marathon (San Leandro) 10K
- San Leandro, California
Actual distance
- La Jolla Half Marathon, 10K & 5K
- 10 km
- Summer Breeze Half Marathon (San Leandro) 10K
- 10 km
raceindex.org mapped route held
- La Jolla Half Marathon, 10K & 5K
- Held
- Summer Breeze Half Marathon (San Leandro) 10K
- Held
raceindex.org elevation profile held
- La Jolla Half Marathon, 10K & 5K
- Held
- Summer Breeze Half Marathon (San Leandro) 10K
- Held
Course type
- La Jolla Half Marathon, 10K & 5K
- Unavailable
- Summer Breeze Half Marathon (San Leandro) 10K
- Out And Back
Surface
- La Jolla Half Marathon, 10K & 5K
- Unavailable
- Summer Breeze Half Marathon (San Leandro) 10K
- Paved bayside trail (Marina Bay Trail / San Leandro Marina shoreline path).
Elevation character
- La Jolla Half Marathon, 10K & 5K
- Net Downhill
- Summer Breeze Half Marathon (San Leandro) 10K
- Unavailable
Terrain
- La Jolla Half Marathon, 10K & 5K
- Road
- Summer Breeze Half Marathon (San Leandro) 10K
- Trail
Scenery
- La Jolla Half Marathon, 10K & 5K
- Forest, Coastal, Waterfront, Parkland, City
- Summer Breeze Half Marathon (San Leandro) 10K
- Coastal, Waterfront, Parkland
Atmosphere
- La Jolla Half Marathon, 10K & 5K
- Scenic Tour, Destination, Competitive
- Summer Breeze Half Marathon (San Leandro) 10K
- Community, Scenic Tour
Total ascent
- La Jolla Half Marathon, 10K & 5K
- 76 m
- Summer Breeze Half Marathon (San Leandro) 10K
- 0 m
Climbing density
- La Jolla Half Marathon, 10K & 5K
- 7.6 m/km
- Summer Breeze Half Marathon (San Leandro) 10K
- 0.0 m/km
Total descent
- La Jolla Half Marathon, 10K & 5K
- 197 m
- Summer Breeze Half Marathon (San Leandro) 10K
- 0 m
Net elevation
- La Jolla Half Marathon, 10K & 5K
- -121 m
- Summer Breeze Half Marathon (San Leandro) 10K
- -0 m
Max absolute grade
- La Jolla Half Marathon, 10K & 5K
- 12.4%
- Summer Breeze Half Marathon (San Leandro) 10K
- 1.7%
Flat grade share
- La Jolla Half Marathon, 10K & 5K
- 56.0%
- Summer Breeze Half Marathon (San Leandro) 10K
- 100.0%
GAP factor
- La Jolla Half Marathon, 10K & 5K
- -4.5%
- Summer Breeze Half Marathon (San Leandro) 10K
- 0.0%
Entry model
- La Jolla Half Marathon, 10K & 5K
- Open
- Summer Breeze Half Marathon (San Leandro) 10K
- Open
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, La Jolla Half Marathon, 10K & 5K or Summer Breeze Half Marathon (San Leandro) 10K?
La Jolla Half Marathon, 10K & 5K has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.