Flat grade share
- Idaho Falls Marathon
- 96.4% Favoured
Jack & Jill's Downhill Marathon & Half 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 ofJack & Jill's Downhill Marathon & Half or Idaho Falls Marathon — which comes out ahead?
Jack & Jill's Downhill Marathon & Half and Idaho Falls Marathon split the available advantages, so the better choice depends on which metric matters most to the runner.
Route comparison snapshot
Jack & Jill's Downhill Marathon & Half
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.5%
- flat grade share
- 36.1%
- lower ascent
- 783 m
- climbing density
- 18.5 m/km
- net elevation
- -268 m
- maximum grade
- 31.0%
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 | Jack & Jill's Downhill Marathon & Half | Idaho Falls Marathon |
|---|---|---|
| Flat grade share | 36.1% | 96.4% ✓ |
| GAP factor (% slower than flat) | 1.5% | 0.3% ✓ |
| Uphill share | 28.4% | 1.8% |
| Steep-up share | 12.1% | 0.1% |
| Downhill share | 35.5% | 1.8% |
| Total ascent (m) | 783 m | 69 m |
| Climbing density (m/km) | 18.5 m/km | 1.6 m/km |
| Longest climb length (m) | 540 m | 530 m |
| Longest climb gain (m) | 24 m | 9 m |
| Longest climb average grade | 4.5% | 1.7% |
| Total descent (m) | 1,051 m | 52 m |
| Net elevation (m) | -268 m | 15 m |
| Max absolute grade | 31.0% | 10.9% |
| Start elevation (m) | 780 m | 1,416 m |
| Finish elevation (m) | 512 m | 1,431 m |
| Scenic score | 100/100 ✓ | 83/100 |
| Conditions | 75/100 ✓ | 43/100 |
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
Scenic score
- Jack & Jill's Downhill Marathon & Half
- 100/100 Favoured
- Idaho Falls Marathon
- 83/100
Conditions
- Jack & Jill's Downhill Marathon & Half
- 75/100 Favoured
- Idaho Falls Marathon
- 43/100
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 | Jack & Jill's Downhill Marathon & Half | Idaho Falls 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 2026-07-25 (legacy event-level date). |
| Location | Hyak (Snoqualmie Pass) to North Bend, Washington | 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 | Point To Point | Loop |
| Surface | Smooth, hard Packed gravel rail trail | Unavailable |
| Elevation character | Net Downhill | Gently Rolling |
| Terrain | Trail, Gravel | Road |
| Scenery | Mountain, Waterfront, Countryside, Historic, Parkland, Forest, Lakeside | Riverside, Waterfront, Countryside, City, Historic, Parkland |
| Atmosphere | Destination, Scenic Tour, Wilderness | Community, Charity |
| Technicality | Non Technical | Non Technical |
| Total ascent | 783 m | 69 m |
| Climbing density | 18.5 m/km | 1.6 m/km |
| Total descent | 1,051 m | 52 m |
| Net elevation | -268 m | 15 m |
| Max absolute grade | 31.0% | 10.9% |
| Flat grade share | 36.1% | 96.4% |
| GAP factor | 1.5% | 0.3% |
| Cutoff | 6:30:00 | 6:00:00 |
| Entry model | Open | Open |
| Qualifying status | Boston_equivalent | Boston_equivalent |
Schedule
- Jack & Jill's Downhill Marathon & Half
Exact race date not confirmed. Event weekend starts 2026-07-25 (legacy event-level date).
- Idaho Falls Marathon
Exact race date not confirmed. Event weekend starts 2026-07-25 (legacy event-level date).
Location
- Jack & Jill's Downhill Marathon & Half
- Hyak (Snoqualmie Pass) to North Bend, Washington
- Idaho Falls Marathon
- Idaho Falls, Idaho
Actual distance
- Jack & Jill's Downhill Marathon & Half
- 42.2 km
- Idaho Falls Marathon
- 42.2 km
raceindex.org mapped route held
- Jack & Jill's Downhill Marathon & Half
- Held
- Idaho Falls Marathon
- Held
raceindex.org elevation profile held
- Jack & Jill's Downhill Marathon & Half
- Held
- Idaho Falls Marathon
- Held
Course type
- Jack & Jill's Downhill Marathon & Half
- Point To Point
- Idaho Falls Marathon
- Loop
Surface
- Jack & Jill's Downhill Marathon & Half
- Smooth, hard Packed gravel rail trail
- Idaho Falls Marathon
- Unavailable
Elevation character
- Jack & Jill's Downhill Marathon & Half
- Net Downhill
- Idaho Falls Marathon
- Gently Rolling
Terrain
- Jack & Jill's Downhill Marathon & Half
- Trail, Gravel
- Idaho Falls Marathon
- Road
Scenery
- Jack & Jill's Downhill Marathon & Half
- Mountain, Waterfront, Countryside, Historic, Parkland, Forest, Lakeside
- Idaho Falls Marathon
- Riverside, Waterfront, Countryside, City, Historic, Parkland
Atmosphere
- Jack & Jill's Downhill Marathon & Half
- Destination, Scenic Tour, Wilderness
- Idaho Falls Marathon
- Community, Charity
Technicality
- Jack & Jill's Downhill Marathon & Half
- Non Technical
- Idaho Falls Marathon
- Non Technical
Total ascent
- Jack & Jill's Downhill Marathon & Half
- 783 m
- Idaho Falls Marathon
- 69 m
Climbing density
- Jack & Jill's Downhill Marathon & Half
- 18.5 m/km
- Idaho Falls Marathon
- 1.6 m/km
Total descent
- Jack & Jill's Downhill Marathon & Half
- 1,051 m
- Idaho Falls Marathon
- 52 m
Net elevation
- Jack & Jill's Downhill Marathon & Half
- -268 m
- Idaho Falls Marathon
- 15 m
Max absolute grade
- Jack & Jill's Downhill Marathon & Half
- 31.0%
- Idaho Falls Marathon
- 10.9%
Flat grade share
- Jack & Jill's Downhill Marathon & Half
- 36.1%
- Idaho Falls Marathon
- 96.4%
GAP factor
- Jack & Jill's Downhill Marathon & Half
- 1.5%
- Idaho Falls Marathon
- 0.3%
Cutoff
- Jack & Jill's Downhill Marathon & Half
- 6:30:00
- Idaho Falls Marathon
- 6:00:00
Entry model
- Jack & Jill's Downhill Marathon & Half
- Open
- Idaho Falls Marathon
- Open
Qualifying status
- Jack & Jill's Downhill Marathon & Half
- Boston_equivalent
- 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, Jack & Jill's Downhill Marathon & Half 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.