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