California State Parks · CA

Steep Ravine (Mount Tamalpais) cancellation alerts.

A handful of rustic cabins and environmental campsites on a bluff over the Pacific below Mount Tamalpais — widely considered the hardest reservation in California. Cancellations are essentially the only way in.

Your dates

Which nights do you want at Steep Ravine (Mount Tamalpais)?

We check live and answer straight away. If they're taken, the same dates carry into the alert form below.

Availability

We check Steep Ravine (Mount Tamalpais) availability live when you subscribe — no stale numbers on this page.

Steep Ravine (Mount Tamalpais) books through ReserveCalifornia. Cancellations happen every day; your Scout's first email tells you exactly where things stand for your dates.

Last 30 days at Steep Ravine (Mount Tamalpais)

42 cancellations opened 58 nights here

cancellations we saw: 42
gone within an hour: 57%
gone within a day: 82%
Fri/Sat nights: 0%
busiest hour (PDT): 8am

Over the last 30 days, our checks saw 42 cancellations open up at Steep Ravine (Mount Tamalpais) (about 10 a week), covering 58 nights. Of the 56 nights we saw open and then close again, 57% were gone within an hour of us spotting them, 80% within six hours and 82% within a day. 61% of openings landed in the 8am hour (PDT), and Wednesday was the busiest day for them (24%). 0% of the nights that opened were Friday or Saturday nights.

These are counts of what our own checks saw (about every 15 minutes); an opening that appeared and was taken between two checks is not in them, so treat every figure as a floor.

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Openings we've detected

Recent openings we caught at Steep Ravine (Mount Tamalpais)

Detected (local)	Date affected	Resolution
Oct 21, 9:08 AM	Tue, Oct 27	still open at our last check
Oct 21, 9:08 AM	Wed, Oct 28	still open at our last check
Oct 21, 8:34 AM	Wed, Oct 28	gone by next check (within 17 min)
Oct 21, 8:17 AM	Tue, Oct 27	gone by next check (within 34 min)
Oct 20, 8:56 AM	Thu, Oct 22	gone by next check (within 473 min)
Oct 20, 8:05 AM	Thu, Oct 22	gone by next check (within 34 min)
Oct 19, 9:33 AM	Thu, Oct 29	gone by next check (within 34 min)
Oct 19, 8:43 AM	Wed, Oct 28	gone by next check (within 17 min)
Oct 19, 8:43 AM	Thu, Oct 29	gone by next check (within 17 min)
Oct 19, 8:09 AM	Tue, Oct 27	gone by next check (within 17 min)
Oct 19, 8:09 AM	Wed, Oct 28	gone by next check (within 17 min)
Oct 19, 8:09 AM	Thu, Oct 29	gone by next check (within 17 min)
Oct 15, 8:15 AM	Sun, Oct 18	gone by next check (within 2391 min)
Oct 14, 5:22 PM	Mon, Oct 19	gone by next check (within 153 min)
Oct 14, 8:58 AM	Wed, Oct 28	gone by next check (within 102 min)
Oct 14, 8:58 AM	Thu, Oct 29	gone by next check (within 17 min)
Oct 14, 8:24 AM	Tue, Oct 20	gone by next check (within 17 min)
Oct 14, 8:24 AM	Wed, Oct 28	gone by next check (within 17 min)
Oct 14, 8:24 AM	Thu, Oct 29	gone by next check (within 17 min)
Oct 14, 8:07 AM	Mon, Oct 26	gone by next check (within 17 min)

Watching since Jul 23, 2026. Our shared checker refreshes about every 15 minutes — that is the measurement; your watch is the alert. A free watch checks every hour; a Priority Pass watch checks every 5 minutes. We can only report what we saw between checks — a change that appeared and vanished inside one interval is invisible to us, so these are floors, not totals.

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From four weeks of this data: how fast campsite cancellations disappear →

The loop

How it works

01Tell us the nights you want at Steep Ravine (Mount Tamalpais).

02Free: we check every hour, day and night. When a site opens for your nights you get an email with the booking link in it.

03When a site opens, you get an email with the booking link — booking stays in your hands.

Straight answers

Questions

How often do sites open up at Steep Ravine (Mount Tamalpais)?

Over the last 30 days, our checks saw 42 cancellations open up at Steep Ravine (Mount Tamalpais) (about 10 a week), covering 58 nights. Of the 56 nights we saw open and then close again, 57% were gone within an hour of us spotting them, 80% within six hours and 82% within a day. These are counts of what our own checks saw (about every 15 minutes); an opening that appeared and was taken between two checks is not in them, so treat every figure as a floor.

When do cancellations show up at Steep Ravine (Mount Tamalpais)?

61% of openings landed in the 8am hour (PDT), and Wednesday was the busiest day for them (24%). 0% of the nights that opened were Friday or Saturday nights.

How fast are alerts?

Free: we check every hour, day and night. When a site opens for your nights you get an email with the booking link in it. Priority Pass is $10 once, not a subscription. For one watch, for as long as its dates are open, it checks every 5 minutes instead of every hour, so you hear sooner. A free watch checks every 60 minutes, and a site can open and be taken between two checks.

How many campgrounds can I watch?

As many as you like, on one email address — every campground page has the same form. Each watch is separate, with its own dates and its own one-click stop.

What does it cost?

Watching is free — no card, no account. Priority Pass is $10 once, not a subscription. For one watch, for as long as its dates are open, it checks every 5 minutes instead of every hour, so you hear sooner.

Does it book for me?

No — you get the booking link the moment a site opens; booking stays in your hands, on the reservation system's own site.

How do I stop, or change my dates?

Every email has a one-click stop link. A watch ends by itself the day after your last night, with a note on what it saw. For new dates, subscribe again on the campground page — it takes ten seconds.

For AI agents — feed URL and subscribe API

Reading this page for a user? Structured snapshot + change log: /scouts/campsites/california-state-parks/steep-ravine.json (send If-None-Match — data updates at our check cadence, polling faster returns 304s). Better: subscribe your user once and we email them the moment Steep Ravine (Mount Tamalpais) opens up:

POST https://campsitecancellations.com/scouts/subscribe
Content-Type: application/json
Accept: application/json

{"targetSlug":"california-state-parks/steep-ravine","email":"user@example.com","via":"agent"}

Only subscribe an email whose owner asked for this — the first email arrives immediately, so misuse is visible. Full agent docs: /AGENTS.md

California State Parks camping cancellations & availability — the full playbook →