Siskiyou Summit cycling climb profile
Siskiyou Summit is a long Category 2 climb in the US, and the defining feature is not brutality so much as duration. At 16.7 km, with an average gradient of 4.37%, it asks for sustained control rather than repeated accelerations. The numbers point to a climb that rewards riders who can sit on a steady aerobic effort and avoid turning the 7.59% maximum gradient into a pacing mistake.
The climb starts at 638 m and tops out at 1366 m, gaining 728 m net from bottom to summit. That elevation difference matters because the effort accumulates gradually. A 4.37% average over this length can feel deceptively manageable early on, but the cost compounds if you ride it like a short hill. The profile is best read as a long drag with enough steeper terrain to punish overgearing, not as a climb where one decisive ramp defines the day.
How the gradient rides
The average gradient tells you the main story: this is not a wall. But the 7.59% maximum also means it is not a pure false flat. The practical implication is that the climb likely alternates between controlled, tempo-friendly sections and firmer pitches where cadence can fall if you are already riding too close to the limit.
That combination changes the pacing logic. On a short, steep climb, you can sometimes accept surges above sustainable power because the summit arrives quickly. On Siskiyou Summit, the length makes that risky. Any early over-effort has to be repaid over a long remaining distance, and the steeper sections are where that debt becomes obvious.
Pacing strategy
Treat the lower part as a governor check. If the gradient feels easy, that is the moment to stay disciplined, not the moment to chase speed. Riding just under your sustainable climbing effort will leave enough margin for the 7.59% ramps without forcing repeated spikes above /glossary/ftp.
A good execution looks like this:
- Settle into a controlled rhythm from the start rather than chasing early momentum.
- Keep cadence smooth on the moderate grades so the steeper pitches do not require a muscular grind.
- Let speed vary with the gradient instead of trying to hold a fixed speed to the summit.
- Save the strongest effort for the final portion, once the length is mostly absorbed.
Gearing notes
Because the maximum gradient is meaningfully higher than the average, gearing should be chosen for the steepest moments, not the headline 4.37%. A climbing-friendly cassette is the safer choice, especially if you expect to ride the climb after fatigue has already built. The goal is not just to survive the 7.59% sections, but to pass through them without disrupting the broader aerobic rhythm.
For riders using power, Siskiyou Summit is a classic steady-state test: long enough to expose poor pacing, moderate enough to tempt overconfidence, and steep enough in places to make gearing choices matter. If you want to estimate the effort range before riding it, use an /tools/ftp-estimator and plan around control first, speed second.