St. Mary has 1 open night left in October 2026.
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.
We only have live numbers for October 2026 on this page.
Rather than guess: subscribe and the first email tells you where those nights stand.
1 open night in October 2026.
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
| 2349 open | 24full | |||||
| 25full | 26full | 27full | 28full | 29full | 30full | 31full |
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.
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.
Your dates aren't available? Get a free email when one opens ↓
Watching Sat, Nov 28 — the night you tapped. Change the dates below if you like.
Email me when a site opens at St. Mary
Your first email lands right away with where your nights stand. After that we only write when something opens.
Last catch here — a date opened, still open at our last check. That window is what an instant email wins you.
Open this Scout in the builderCheck recreation.gov yourself →
Weekends and prime dates go first. A free watch checks every 60 minutes, and a site can open and be taken between two checks.
Recent openings we caught at St. Mary
| Detected (local) | Date affected | Resolution |
|---|---|---|
| Fri, Oct 23 | still open at our last check | |
| Thu, Oct 22 | still open at our last check | |
| Wed, Oct 21 | still open at our last check | |
| Tue, Oct 20 | still open at our last check | |
| Mon, Oct 19 | still open at our last check | |
| Sun, Oct 18 | still open at our last check | |
| Sat, Oct 17 | still open at our last check | |
| Fri, Oct 16 | still open at our last check | |
| Thu, Oct 15 | still open at our last check | |
| Wed, Oct 14 | still open at our last check | |
| Tue, Oct 13 | still open at our last check | |
| Mon, Oct 12 | still open at our last check | |
| Sun, Oct 11 | still open at our last check | |
| Sat, Oct 10 | still open at our last check | |
| Fri, Oct 9 | still open at our last check | |
| Thu, Oct 8 | still open at our last check | |
| Wed, Oct 7 | still open at our last check | |
| Tue, Oct 6 | still open at our last check | |
| Mon, Oct 5 | still open at our last check | |
| 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.
From four weeks of this data: how fast campsite cancellations disappear →
How it works
Questions
Is St. Mary sold out this weekend?
As of Oct 23, 2:28 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 →
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