Flat grade share
- Idaho Falls Marathon
- 96.4% Favoured
Idaho Falls Marathon vs Norfolk Festival of Running (King's Lynn) Marathon
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofIdaho Falls Marathon or Norfolk Festival of Running (King's Lynn) Marathon — which comes out ahead?
Idaho Falls Marathon has the stronger available profile on flat grade share, course flatness and scenery score.
Route comparison snapshot
Idaho Falls Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 0.3% Favoured
- flat grade share
- 96.4% Favoured
- lower ascent
- 69 m
- climbing density
- 1.6 m/km
- net elevation
- 15 m
- maximum grade
- 10.9%
Norfolk Festival of Running (King's Lynn) Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.6%
- flat grade share
- 45.4%
- lower ascent
- 558 m
- climbing density
- 13.2 m/km
- net elevation
- -0 m
- maximum grade
- 9.8%
| Metric | Idaho Falls Marathon | Norfolk Festival of Running (King's Lynn) Marathon |
|---|---|---|
| Flat grade share | 96.4% ✓ | 45.4% |
| GAP factor (% slower than flat) | 0.3% ✓ | 1.6% |
| Uphill share | 1.8% | 27.3% |
| Steep-up share | 0.1% | 6.0% |
| Downhill share | 1.8% | 27.3% |
| Total ascent (m) | 69 m | 558 m |
| Climbing density (m/km) | 1.6 m/km | 13.2 m/km |
| Longest climb length (m) | 530 m | 140 m |
| Longest climb gain (m) | 9 m | 9 m |
| Longest climb average grade | 1.7% | 6.3% |
| Total descent (m) | 52 m | 558 m |
| Net elevation (m) | 15 m | -0 m |
| Max absolute grade | 10.9% | 9.8% |
| Start elevation (m) | 1,416 m | 18 m |
| Finish elevation (m) | 1,431 m | 18 m |
| Value | Unavailable | 83/100 |
| Scenic score | 83/100 ✓ | 65/100 |
| Conditions | 43/100 | 61/100 ✓ |
| Entry fee (GBP) | Unavailable | £38 |
| Lowest modelled true cost (GBP) | Unavailable | £168 |
GAP factor (% slower than flat)
- Idaho Falls Marathon
- 0.3% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- Idaho Falls Marathon
- 1.6 m/km
Longest climb length (m)
- Idaho Falls Marathon
- 530 m
Longest climb gain (m)
Longest climb average grade
Total descent (m)
Net elevation (m)
Max absolute grade
- Idaho Falls Marathon
- 10.9%
Start elevation (m)
- Idaho Falls Marathon
- 1,416 m
Finish elevation (m)
- Idaho Falls Marathon
- 1,431 m
Value
- Idaho Falls Marathon
- Unavailable
Scenic score
- Idaho Falls Marathon
- 83/100 Favoured
Conditions
- Idaho Falls Marathon
- 43/100
- Norfolk Festival of Running (King's Lynn) Marathon
- 61/100 Favoured
Entry fee (GBP)
- Idaho Falls Marathon
- Unavailable
Lowest modelled true cost (GBP)
- Idaho Falls Marathon
- 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 | Idaho Falls Marathon | Norfolk Festival of Running (King's Lynn) Marathon |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-07-25 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2026-07-12 (legacy event-level date). |
| Location | Idaho Falls, Idaho | King's Lynn, East Of England |
| Actual distance | 42.2 km | 42.2 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Loop | Laps |
| Surface | Unavailable | Trail course over sand, gravel and grass |
| Elevation character | Gently Rolling | Gently Rolling |
| Terrain | Road | Trail, Gravel |
| Scenery | Riverside, Waterfront, Countryside, City, Historic, Parkland | Parkland, Countryside, Lakeside, Forest |
| Atmosphere | Community, Charity | Festival, Community |
| Technicality | Non Technical | Non Technical |
| Total ascent | 69 m | 558 m |
| Climbing density | 1.6 m/km | 13.2 m/km |
| Total descent | 52 m | 558 m |
| Net elevation | 15 m | -0 m |
| Max absolute grade | 10.9% | 9.8% |
| Flat grade share | 96.4% | 45.4% |
| GAP factor | 0.3% | 1.6% |
| Cutoff | 6:00:00 | 6:00:00 |
| Entry model | Open | Open |
| Entry fee | Unavailable | £38 |
| Lowest modelled true cost | Unavailable | £168 |
| Cost model origin | Unavailable | National Average |
| Qualifying status | Boston_equivalent | Unavailable |
Schedule
- Idaho Falls Marathon
Exact race date not confirmed. Event weekend starts 2026-07-25 (legacy event-level date).
- Norfolk Festival of Running (King's Lynn) Marathon
Exact race date not confirmed. Event weekend starts 2026-07-12 (legacy event-level date).
Location
- Idaho Falls Marathon
- Idaho Falls, Idaho
- Norfolk Festival of Running (King's Lynn) Marathon
- King's Lynn, East Of England
Actual distance
- Idaho Falls Marathon
- 42.2 km
- Norfolk Festival of Running (King's Lynn) Marathon
- 42.2 km
raceindex.org mapped route held
- Idaho Falls Marathon
- Held
- Norfolk Festival of Running (King's Lynn) Marathon
- Held
raceindex.org elevation profile held
- Idaho Falls Marathon
- Held
- Norfolk Festival of Running (King's Lynn) Marathon
- Held
Course type
- Idaho Falls Marathon
- Loop
- Norfolk Festival of Running (King's Lynn) Marathon
- Laps
Surface
- Idaho Falls Marathon
- Unavailable
- Norfolk Festival of Running (King's Lynn) Marathon
- Trail course over sand, gravel and grass
Elevation character
- Idaho Falls Marathon
- Gently Rolling
- Norfolk Festival of Running (King's Lynn) Marathon
- Gently Rolling
Terrain
- Idaho Falls Marathon
- Road
- Norfolk Festival of Running (King's Lynn) Marathon
- Trail, Gravel
Scenery
- Idaho Falls Marathon
- Riverside, Waterfront, Countryside, City, Historic, Parkland
- Norfolk Festival of Running (King's Lynn) Marathon
- Parkland, Countryside, Lakeside, Forest
Atmosphere
- Idaho Falls Marathon
- Community, Charity
- Norfolk Festival of Running (King's Lynn) Marathon
- Festival, Community
Technicality
- Idaho Falls Marathon
- Non Technical
- Norfolk Festival of Running (King's Lynn) Marathon
- Non Technical
Total ascent
- Idaho Falls Marathon
- 69 m
- Norfolk Festival of Running (King's Lynn) Marathon
- 558 m
Climbing density
- Idaho Falls Marathon
- 1.6 m/km
- Norfolk Festival of Running (King's Lynn) Marathon
- 13.2 m/km
Total descent
- Idaho Falls Marathon
- 52 m
- Norfolk Festival of Running (King's Lynn) Marathon
- 558 m
Net elevation
- Idaho Falls Marathon
- 15 m
- Norfolk Festival of Running (King's Lynn) Marathon
- -0 m
Max absolute grade
- Idaho Falls Marathon
- 10.9%
- Norfolk Festival of Running (King's Lynn) Marathon
- 9.8%
Flat grade share
- Idaho Falls Marathon
- 96.4%
- Norfolk Festival of Running (King's Lynn) Marathon
- 45.4%
GAP factor
- Idaho Falls Marathon
- 0.3%
- Norfolk Festival of Running (King's Lynn) Marathon
- 1.6%
Cutoff
- Idaho Falls Marathon
- 6:00:00
- Norfolk Festival of Running (King's Lynn) Marathon
- 6:00:00
Entry model
- Idaho Falls Marathon
- Open
- Norfolk Festival of Running (King's Lynn) Marathon
- Open
Entry fee
- Idaho Falls Marathon
- Unavailable
- Norfolk Festival of Running (King's Lynn) Marathon
- £38
Lowest modelled true cost
- Idaho Falls Marathon
- Unavailable
- Norfolk Festival of Running (King's Lynn) Marathon
- £168
Cost model origin
- Idaho Falls Marathon
- Unavailable
- Norfolk Festival of Running (King's Lynn) Marathon
- National Average
Qualifying status
- Idaho Falls Marathon
- Boston_equivalent
- Norfolk Festival of Running (King's Lynn) Marathon
- 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, Idaho Falls Marathon or Norfolk Festival of Running (King's Lynn) Marathon?
Idaho Falls Marathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.