Glacier National Park · MT

St. Mary has 1 open night left in October 2026.

St. Mary campground — Photo: Recreation.gov

On Glacier's drier east side at the foot of St. Mary Lake — the eastern gateway to Going-to-the-Sun Road. High-season nights book out months ahead.

Your dates

Full for your dates. Every night you asked for is taken at St. Mary.

A free watch checks every 60 minutes, and a site can open and be taken between two checks. An email is how you hear.

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Your dates are already filled in below — just add your email.

Live availability

checked 14 minutes ago via recreation.gov

1 open night in October 2026.

October 2026→

open — tap to book on recreation.govfull — tap to get alerted for that nightweekend

These are live numbers for October 2026, checked when you loaded the page. A watch covers any dates you like.

Last 30 days at St. Mary

30 cancellations opened 30 nights here

cancellations we saw: 30
Fri/Sat nights: 30%
busiest hour (MDT): 6am

Over the last 30 days, our checks saw 30 cancellations open up at St. Mary (about 7 a week), covering 30 nights. 70% of openings landed in the 6am hour (MDT), and Friday was the busiest day for them (17%). 30% 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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Weekends and prime dates go first. A free watch checks every 60 minutes, and a site can open and be taken between two checks.

Openings we've detected

Recent openings we caught at St. Mary

Detected (local)	Date affected	Resolution
Oct 23, 6:34 AM	Fri, Oct 23	still open at our last check
Oct 22, 6:30 AM	Thu, Oct 22	still open at our last check
Oct 21, 6:37 AM	Wed, Oct 21	still open at our last check
Oct 20, 6:54 AM	Tue, Oct 20	still open at our last check
Oct 19, 6:49 AM	Mon, Oct 19	still open at our last check
Oct 18, 6:50 AM	Sun, Oct 18	still open at our last check
Oct 17, 6:19 AM	Sat, Oct 17	still open at our last check
Oct 16, 6:37 AM	Fri, Oct 16	still open at our last check
Oct 15, 6:52 AM	Thu, Oct 15	still open at our last check
Oct 14, 6:14 AM	Wed, Oct 14	still open at our last check
Oct 13, 6:34 AM	Tue, Oct 13	still open at our last check
Oct 12, 6:28 AM	Mon, Oct 12	still open at our last check
Oct 11, 7:04 AM	Sun, Oct 11	still open at our last check
Oct 10, 6:26 AM	Sat, Oct 10	still open at our last check
Oct 9, 7:03 AM	Fri, Oct 9	still open at our last check
Oct 8, 7:24 AM	Thu, Oct 8	still open at our last check
Oct 7, 6:47 AM	Wed, Oct 7	still open at our last check
Oct 6, 6:20 AM	Tue, Oct 6	still open at our last check
Oct 5, 6:36 AM	Mon, Oct 5	still open at our last check
Oct 4, 6:50 AM	Sun, Oct 4	still open at our last check

Watching since Jul 13, 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 St. Mary.

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

Is St. Mary sold out this weekend?

As of Oct 23, 1:16 PM MDT, Fri, Oct 23 has 49 sites open and Sat, Oct 24 is full at St. Mary. Open nights are bookable right now on recreation.gov.

How often do sites open up at St. Mary?

Over the last 30 days, our checks saw 30 cancellations open up at St. Mary (about 7 a week), covering 30 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.

When do cancellations show up at St. Mary?

70% of openings landed in the 6am hour (MDT), and Friday was the busiest day for them (17%). 30% 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/glacier/st-mary.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 St. Mary opens up:

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

{"targetSlug":"glacier/st-mary","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

Glacier National Park camping cancellations & availability — the full playbook →