Flat grade share
- Garmin New Forest Marathon 10K
- 89.0% Favoured
Garmin New Forest Marathon 10K vs Southampton Marathon 10K
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofGarmin New Forest Marathon 10K or Southampton Marathon 10K — which comes out ahead?
Garmin New Forest Marathon 10K and Southampton Marathon 10K split the available advantages, so the better choice depends on which metric matters most to the runner.
Route comparison snapshot
Garmin New Forest Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 0.2% Favoured
- flat grade share
- 89.0% Favoured
- lower ascent
- 40 m
- climbing density
- 4.0 m/km
- net elevation
- -2 m
- maximum grade
- 6.3%
Southampton Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.4%
- flat grade share
- 76.8%
- lower ascent
- 70 m
- climbing density
- 7.0 m/km
- net elevation
- 14 m
- maximum grade
- 13.8%
| Metric | Garmin New Forest Marathon 10K | Southampton Marathon 10K |
|---|---|---|
| Flat grade share | 89.0% ✓ | 76.8% |
| GAP factor (% slower than flat) | 0.2% ✓ | 1.4% |
| Uphill share | 5.5% | 13.4% |
| Steep-up share | 0.0% | 1.6% |
| Downhill share | 5.5% | 9.7% |
| Total ascent (m) | 40 m | 70 m |
| Climbing density (m/km) | 4.0 m/km | 7.0 m/km |
| Longest climb length (m) | 1,010 m | 750 m |
| Longest climb gain (m) | 12 m | 17 m |
| Longest climb average grade | 1.2% | 2.2% |
| Total descent (m) | 41 m | 56 m |
| Net elevation (m) | -2 m | 14 m |
| Max absolute grade | 6.3% | 13.8% |
| Start elevation (m) | 21 m | 3 m |
| Finish elevation (m) | 20 m | 18 m |
| Value | 82/100 | Unavailable |
| Scenic score | 75/100 | 86/100 ✓ |
| Conditions | 67/100 | 87/100 ✓ |
| Entry fee (GBP) | £43 | Unavailable |
| Lowest modelled true cost (GBP) | £173 | Unavailable |
GAP factor (% slower than flat)
- Garmin New Forest Marathon 10K
- 0.2% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- Garmin New Forest Marathon 10K
- 4.0 m/km
- Southampton Marathon 10K
- 7.0 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
- Southampton Marathon 10K
- Unavailable
Scenic score
- Southampton Marathon 10K
- 86/100 Favoured
Conditions
- Southampton Marathon 10K
- 87/100 Favoured
Entry fee (GBP)
- Southampton Marathon 10K
- Unavailable
Lowest modelled true cost (GBP)
- Southampton Marathon 10K
- 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
| Fact | Garmin New Forest Marathon 10K | Southampton Marathon 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-09-13 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date). |
| Location | Brockenhurst, South East | Southampton, South East |
| Actual distance | 10 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Surface | Multi Terrain: compact gravel forest tracks with some tarmac sections; flat and fast throughout. | Unavailable |
| Scenery | Countryside, Forest, Parkland, Moorland | City, Coastal, Historic, Parkland, Waterfront, Riverside |
| Atmosphere | Scenic Tour, Festival | Big City, Festival, Community |
| Total ascent | 40 m | 70 m |
| Climbing density | 4.0 m/km | 7.0 m/km |
| Total descent | 41 m | 56 m |
| Net elevation | -2 m | 14 m |
| Max absolute grade | 6.3% | 13.8% |
| Flat grade share | 89.0% | 76.8% |
| GAP factor | 0.2% | 1.4% |
| Cutoff | Unavailable | 2:00:00 |
| Entry model | Open | Open |
| Entry fee | £43 | Unavailable |
| Lowest modelled true cost | £173 | Unavailable |
| Cost model origin | National Average | Unavailable |
| Measured course | Unavailable | Yes |
Schedule
- Garmin New Forest Marathon 10K
Exact race date not confirmed. Event weekend starts 2026-09-13 (legacy event-level date).
- Southampton Marathon 10K
Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date).
Location
- Garmin New Forest Marathon 10K
- Brockenhurst, South East
- Southampton Marathon 10K
- Southampton, South East
Actual distance
- Garmin New Forest Marathon 10K
- 10 km
- Southampton Marathon 10K
- 10 km
raceindex.org mapped route held
- Garmin New Forest Marathon 10K
- Held
- Southampton Marathon 10K
- Held
raceindex.org elevation profile held
- Garmin New Forest Marathon 10K
- Held
- Southampton Marathon 10K
- Held
Surface
- Garmin New Forest Marathon 10K
- Multi Terrain: compact gravel forest tracks with some tarmac sections; flat and fast throughout.
- Southampton Marathon 10K
- Unavailable
Scenery
- Garmin New Forest Marathon 10K
- Countryside, Forest, Parkland, Moorland
- Southampton Marathon 10K
- City, Coastal, Historic, Parkland, Waterfront, Riverside
Atmosphere
- Garmin New Forest Marathon 10K
- Scenic Tour, Festival
- Southampton Marathon 10K
- Big City, Festival, Community
Total ascent
- Garmin New Forest Marathon 10K
- 40 m
- Southampton Marathon 10K
- 70 m
Climbing density
- Garmin New Forest Marathon 10K
- 4.0 m/km
- Southampton Marathon 10K
- 7.0 m/km
Total descent
- Garmin New Forest Marathon 10K
- 41 m
- Southampton Marathon 10K
- 56 m
Net elevation
- Garmin New Forest Marathon 10K
- -2 m
- Southampton Marathon 10K
- 14 m
Max absolute grade
- Garmin New Forest Marathon 10K
- 6.3%
- Southampton Marathon 10K
- 13.8%
Flat grade share
- Garmin New Forest Marathon 10K
- 89.0%
- Southampton Marathon 10K
- 76.8%
GAP factor
- Garmin New Forest Marathon 10K
- 0.2%
- Southampton Marathon 10K
- 1.4%
Cutoff
- Garmin New Forest Marathon 10K
- Unavailable
- Southampton Marathon 10K
- 2:00:00
Entry model
- Garmin New Forest Marathon 10K
- Open
- Southampton Marathon 10K
- Open
Entry fee
- Garmin New Forest Marathon 10K
- £43
- Southampton Marathon 10K
- Unavailable
Lowest modelled true cost
- Garmin New Forest Marathon 10K
- £173
- Southampton Marathon 10K
- Unavailable
Cost model origin
- Garmin New Forest Marathon 10K
- National Average
- Southampton Marathon 10K
- Unavailable
Measured course
- Garmin New Forest Marathon 10K
- Unavailable
- Southampton Marathon 10K
- Yes
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, Garmin New Forest Marathon 10K or Southampton Marathon 10K?
Garmin New Forest Marathon 10K has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.