Flat grade share
- Ice Age Trail 50 Half Marathon
- 64.3% Favoured
Ice Age Trail 50 Ultramarathon vs Ice Age Trail 50 Half Marathon
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofIce Age Trail 50 Ultramarathon or Ice Age Trail 50 Half Marathon — which comes out ahead?
Ice Age Trail 50 Half Marathon has the stronger available profile on flat grade share and course flatness.
Route comparison snapshot
Ice Age Trail 50 Ultramarathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 2.9%
- flat grade share
- 47.8%
- lower ascent
- 1,263 m
- climbing density
- 15.7 m/km
- net elevation
- 0 m
- maximum grade
- 22.6%
Ice Age Trail 50 Half Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.5% Favoured
- flat grade share
- 64.3% Favoured
- lower ascent
- 235 m
- climbing density
- 11.1 m/km
- net elevation
- 1 m
- maximum grade
- 11.3%
| Metric | Ice Age Trail 50 Ultramarathon | Ice Age Trail 50 Half Marathon |
|---|---|---|
| Flat grade share | 47.8% | 64.3% ✓ |
| GAP factor (% slower than flat) | 2.9% | 1.5% ✓ |
| Uphill share | 26.1% | 18.4% |
| Steep-up share | 9.2% | 6.2% |
| Downhill share | 26.1% | 17.4% |
| Total ascent (m) | 1,263 m | 235 m |
| Climbing density (m/km) | 15.7 m/km | 11.1 m/km |
| Longest climb length (m) | 720 m | 580 m |
| Longest climb gain (m) | 51 m | 27 m |
| Longest climb average grade | 7.0% | 4.7% |
| Total descent (m) | 1,263 m | 234 m |
| Net elevation (m) | 0 m | 1 m |
| Max absolute grade | 22.6% | 11.3% |
| Start elevation (m) | 294 m | 294 m |
| Finish elevation (m) | 295 m | 294 m |
GAP factor (% slower than flat)
- Ice Age Trail 50 Half Marathon
- 1.5% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- Ice Age Trail 50 Ultramarathon
- 15.7 m/km
- Ice Age Trail 50 Half Marathon
- 11.1 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)
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.
Same-distance comparisons are most meaningful; cross-distance metrics are contextual.
Race facts that change the decision
| Fact | Ice Age Trail 50 Ultramarathon | Ice Age Trail 50 Half Marathon |
|---|---|---|
| Schedule | Exact race date not confirmed. | Exact race date not confirmed. |
| Location | Whitewater, Wisconsin | Whitewater, Wisconsin |
| Actual distance | 80.5 km | 21.1 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Out And Back | Laps |
| Surface | Mostly single Track dirt, rocky and tree Rooted trail through pinewoods, hardwood forests and rolling prairie, with Ice Age Trail eskers and incessant hills. | Two Loop counter Clockwise course on very wide, scenic, runnable Nordic ski trails through hardwoods, pine plantations, open meadows and kettle moraine terrain with hills. |
| Elevation character | Rolling | Unavailable |
| Terrain | Beach, Trail | Unavailable |
| Scenery | Desert, Countryside, Forest, Parkland, Lakeside | Countryside, Forest, Parkland, Lakeside |
| Atmosphere | Wilderness, Scenic Tour, Competitive | Wilderness, Scenic Tour, Competitive |
| Technicality | Technical | Unavailable |
| Total ascent | 1,263 m | 235 m |
| Climbing density | 15.7 m/km | 11.1 m/km |
| Total descent | 1,263 m | 234 m |
| Net elevation | 0 m | 1 m |
| Max absolute grade | 22.6% | 11.3% |
| Flat grade share | 47.8% | 64.3% |
| GAP factor | 2.9% | 1.5% |
| Cutoff | 12:00:00 | 4:00:00 |
| Entry model | Open | Open |
Schedule
- Ice Age Trail 50 Ultramarathon
Exact race date not confirmed.
- Ice Age Trail 50 Half Marathon
Exact race date not confirmed.
Location
- Ice Age Trail 50 Ultramarathon
- Whitewater, Wisconsin
- Ice Age Trail 50 Half Marathon
- Whitewater, Wisconsin
Actual distance
- Ice Age Trail 50 Ultramarathon
- 80.5 km
- Ice Age Trail 50 Half Marathon
- 21.1 km
raceindex.org mapped route held
- Ice Age Trail 50 Ultramarathon
- Held
- Ice Age Trail 50 Half Marathon
- Held
raceindex.org elevation profile held
- Ice Age Trail 50 Ultramarathon
- Held
- Ice Age Trail 50 Half Marathon
- Held
Course type
- Ice Age Trail 50 Ultramarathon
- Out And Back
- Ice Age Trail 50 Half Marathon
- Laps
Surface
- Ice Age Trail 50 Ultramarathon
- Mostly single Track dirt, rocky and tree Rooted trail through pinewoods, hardwood forests and rolling prairie, with Ice Age Trail eskers and incessant hills.
- Ice Age Trail 50 Half Marathon
- Two Loop counter Clockwise course on very wide, scenic, runnable Nordic ski trails through hardwoods, pine plantations, open meadows and kettle moraine terrain with hills.
Elevation character
- Ice Age Trail 50 Ultramarathon
- Rolling
- Ice Age Trail 50 Half Marathon
- Unavailable
Terrain
- Ice Age Trail 50 Ultramarathon
- Beach, Trail
- Ice Age Trail 50 Half Marathon
- Unavailable
Scenery
- Ice Age Trail 50 Ultramarathon
- Desert, Countryside, Forest, Parkland, Lakeside
- Ice Age Trail 50 Half Marathon
- Countryside, Forest, Parkland, Lakeside
Atmosphere
- Ice Age Trail 50 Ultramarathon
- Wilderness, Scenic Tour, Competitive
- Ice Age Trail 50 Half Marathon
- Wilderness, Scenic Tour, Competitive
Technicality
- Ice Age Trail 50 Ultramarathon
- Technical
- Ice Age Trail 50 Half Marathon
- Unavailable
Total ascent
- Ice Age Trail 50 Ultramarathon
- 1,263 m
- Ice Age Trail 50 Half Marathon
- 235 m
Climbing density
- Ice Age Trail 50 Ultramarathon
- 15.7 m/km
- Ice Age Trail 50 Half Marathon
- 11.1 m/km
Total descent
- Ice Age Trail 50 Ultramarathon
- 1,263 m
- Ice Age Trail 50 Half Marathon
- 234 m
Net elevation
- Ice Age Trail 50 Ultramarathon
- 0 m
- Ice Age Trail 50 Half Marathon
- 1 m
Max absolute grade
- Ice Age Trail 50 Ultramarathon
- 22.6%
- Ice Age Trail 50 Half Marathon
- 11.3%
Flat grade share
- Ice Age Trail 50 Ultramarathon
- 47.8%
- Ice Age Trail 50 Half Marathon
- 64.3%
GAP factor
- Ice Age Trail 50 Ultramarathon
- 2.9%
- Ice Age Trail 50 Half Marathon
- 1.5%
Cutoff
- Ice Age Trail 50 Ultramarathon
- 12:00:00
- Ice Age Trail 50 Half Marathon
- 4:00:00
Entry model
- Ice Age Trail 50 Ultramarathon
- Open
- Ice Age Trail 50 Half Marathon
- 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, Ice Age Trail 50 Ultramarathon or Ice Age Trail 50 Half Marathon?
Ice Age Trail 50 Half Marathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.