Col de Porte from Grenoble
Col de Porte from Grenoble: 18.3 km at 6.2% average and 1,139 m of climbing, up to 1,326 m.
- Distance
- 18.3 km
- Elevation gain
- 1,139 m
- Elevation loss
- 31 m
- Average gradient
- 6.2 %
- Start altitude
- 215 m
- Road
- Departmental road
- Surface
- Paved throughout
- Steepest 500 m
- 13.0 %
- Hardest 2 km
- 9.6 %
- Hardest kilometre
- km 12 · 12.0%
- Above 8%
- 7.2 km (39% of the climb)
- Difficulty index
- 7.0 Sustained
FIETS index: Δaltitude² / (10 × distance) + max(0, summit altitude − 1,000) / 1,000, lengths in metres. How this index works (article in French)
How long does it take?
| Level | Estimated time | Average speed |
|---|---|---|
| 2.0 W/kg — 140 W | 1h59 | 9.3 km/h |
| 3.0 W/kg — 210 W | 1h22 | 13.5 km/h |
| 4.0 W/kg — 280 W | 1h04 | 17.3 km/h |
Estimated for a 70 kg rider on a 9 kg bike, in still air, at a steady effort and without stopping. Wind, a stop at the fountain or a wheel to sit on move these figures by several minutes.
The route
Climb profile
- 10% and above
- 8 to 10%
- 6 to 8%
- 4 to 6%
- under 4%
Kilometre by kilometre
| Km | Gradient | Altitude at the top of the km |
|---|---|---|
| 1 | 0.4 % | 219 m |
| 2 | -0.8 % | 211 m |
| 3 | 1.2 % | 223 m |
| 4 | 7.3 % | 296 m |
| 5 | 7.6 % | 372 m |
| 6 | 6.0 % | 432 m |
| 7 | 9.5 % | 527 m |
| 8 | 9.0 % | 617 m |
| 9 | 9.3 % | 710 m |
| 10 | 8.6 % | 796 m |
| 11 | 3.1 % | 827 m |
| 12 | 12.0 % | 947 m |
| 13 | 2.1 % | 968 m |
| 14 | 6.1 % | 1,028 m |
| 15 | 8.0 % | 1,109 m |
| 16 | 7.9 % | 1,188 m |
| 17 | 6.9 % | 1,258 m |
| 18 | 5.8 % | 1,316 m |
| 19 (partial) | 2.3 % | 1,323 m |
Download the GPX track All climbs of this col
The other climbs of this col
- From Saint-Laurent-du-Pont 16.5 km · 6.2 %
Frequently asked questions
How long is the climb to Col de Porte?
The hardest climb of Col de Porte, from Grenoble, is 18.3 km long for 1,139 m of ascent, i.e. 6.2% average.
What is the steepest part of Col de Porte?
The steepest 500 m sits at 13.0%, and the hardest kilometre is the 12th, at 12.0%.
How long does it take to climb Col de Porte from Grenoble?
Col de Porte from Grenoble takes about 1h22 at 3.0 W/kg, i.e. 13.5 km/h on average. The page gives three levels and their assumptions.
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