Donner Pass

Overview

Donner Pass is a Category 3 climb in the US, running 9.9 km from a start elevation of 1808 m to a summit at 2138 m. On paper it is a modest effort: the net elevation gain is just 330 m, and the average gradient of 3.32% suggests a road you can mostly ride in the big ring. The numbers frame it as a long, steady drag rather than a wall.

That framing is incomplete. The total ascent is 585 m, well above the 330 m of net gain — a gap of 255 m of climbing that does not show up in the point-to-point elevation change. That means the road gives back height along the way and forces you to reclaim it. Every metre you descend mid-climb is a metre you pay for twice. Expect the perceived effort to run harder than the 3.32% average implies, and plan for repeated transitions rather than one continuous grind.

How the Gradient Unfolds

An average of 3.32% across 9.9 km tells you almost nothing about how the road actually feels, because that figure is diluted by flat and downhill sections. The steep work is concentrated: the maximum gradient hits 13.76%, more than four times the average, so the difficulty is packed into short, sharp ramps rather than spread evenly.

• Flatter and false-flat sections where you can recover and hold rhythm
• Short descents and rollers that erase height and break your cadence
• Repeated re-climbs to make up the 255 m of undulation
• A steepest ramp near 13.76% that demands a hard, deliberate effort

Pacing Notes

On an undulating climb like this, chase even effort, not even speed. If you try to hold a constant pace, you will overcook the 13.76% ramps and coast the flats — exactly backwards. Instead, meter your sustainable power output: ease slightly as the road pitches up so you do not spike well over threshold, and keep pressure on through the flatter and downhill sections where most riders soft-pedal and lose free time.

Know your numbers before you start. Use the FTP estimator to set a ceiling, then ride the steep pitches just under it and let the recovery sections bring your average heart rate back down.

Gearing

The 13.76% maximum is what governs your gearing choice, not the gentle average. On a ramp that steep, a standard chainset will have you grinding a low cadence and burning matches. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a bailout gear that keeps your legs spinning through the steepest section.

Check your setup before the ride. Confirm the cassette and chainset combination actually delivers that low gear, and that the derailleur handles the range cleanly.

Summary

• Length: 9.9 km
• Average gradient: 3.32%
• Maximum gradient: 13.76%
• Net elevation gain: 330 m
• Total ascent: 585 m
• Category: 3

Donner Pass rewards riders who read past the average. The 3.32% headline undersells a road that climbs 585 m in total to net just 330 m, with pitches up to 13.76%. Pace by effort, gear for the steep ramps, and treat the undulation as the real challenge.