When campsites actually open up

Anyone who has tried to book a popular campsite knows the drill: the good sites are gone the moment the booking window opens, and your only real shot left is a cancellation. The folk wisdom says to check Friday afternoon, right before the weekend, when people supposedly bail on their plans.

We were curious whether that was actually true, so we measured it. Our system polls campsite availability across BC Parks, Washington State Parks, Ontario Parks, Parks Canada, and two dozen other park systems, every site, around the clock. From 6 to 30 June 2026, the 25 days our monitoring ran across the whole fleet, it recorded every time a booked site flipped back to available.

First: what is an opening, and what is a cancellation?

An “opening” is a booked site returning to the live pool: 832,495 of them over those 25 days. But a site can return to the pool for two very different reasons, and only one of them is a cancelled trip.

Reservation systems put a site into the same “booked” state whether it is genuinely reserved or merely sitting in somebody’s checkout cart. When that cart expires, the site reopens, and to a poller it looks identical to a cancellation. The one thing that separates them is how long the site had been booked before it came back:

• Booked under an hour: 62% of openings. Almost all of this is an expired cart rather than a cancelled trip. A single band does most of the work: 48.4% of all openings came back in the 10-to-60-minute window where checkout carts time out.
• Booked an hour or more: 38%, about 319,000 openings. These are the ones we count as real cancellations.

Both kinds are a genuine chance to book: an abandoned cart frees the site just as effectively as a cancellation does. But they are not the same claim, so we publish both numbers rather than the flattering one: 832,495 openings, of which roughly 319,000 clear the one-hour filter. Below, “opening” means all of them and “cancellation” means the filtered figure.

Openings cluster on weekday mornings, not Friday afternoon

This is the part that surprised us:

• By day of week: cancellations fall away steadily from Monday to Saturday, in that order. An average Monday produced 14,365 against 9,114 on an average Saturday, 1.58× as many. Tuesday is second. By the weekend itself the inventory is already locked in.
• By time of day: 40% land between 8 a.m. and 2 p.m. in the park’s own time, peaking from 10 to noon; stretch the window to 4 p.m. and it is 53%. The curve then eases off all afternoon rather than dropping.

Both charts below convert every opening to its own park’s local clock, so a 10 a.m. in Ontario and a 10 a.m. in British Columbia count as the same hour rather than being filed two zones apart. They count real cancellations only, because a cart expiry is timed by a checkout clock rather than by anybody changing their plans: 277,356 of them across the 23 local days from 7 to 29 June. Parks whose timezone we do not yet record sit this out, 6.4% of openings.

That is a desk-hours shape, and the behaviour behind it is mundane. Somebody whose trip has fallen through sits down at work on a Monday, makes peace with skipping it, and processes the cancellation to claw back part of the fee. Almost nobody does that at 5 p.m. on a Friday, when the pull to get outside is at its strongest. That is the worst moment to expect somebody else to give up their spot.

Sites are taken on almost exactly the same curve as they are freed. Cancellations peak from 10 to noon and re-bookings peak at midday, an hour behind and no sharper, so there is no quiet hour when supply piles up unclaimed and no hour that is uniquely competitive. What changes through the day is not how many spots appear. It is how long one lasts.

And they arrive late, close to the date itself

Knowing the hour only helps if you are already watching. So we followed the seven Friday, Saturday and Sunday nights of late July backwards from 40 days out, and watched where each night’s openings actually landed.

Read the top bar against the bottom one: the stretch when your trip already looks settled is the stretch when the campsites actually move. 52.4% of a night’s openings land in its final seven days, and 31.7% in the final three.

In the unit a waiting camper feels: an average of 21.0% of a weekend night’s campsites came free at least once inside that last week. Across the full 40 days, 31.5% did — so roughly two-thirds of that movement is crammed into the last seven.

And at the popular parks, openings vanish fast

Catching the pattern is only half the battle. At the genuinely contested parks on summer weekends, an opening doesn’t sit there waiting. Take three of BC’s most fought-over parks, Golden Ears, Cultus Lake, and E. C. Manning, on summer Friday, Saturday and Sunday nights:

One caveat runs in your favour, and it is bigger than most people expect: a spot that vanishes in five minutes is usually back. Most grabs are somebody’s cart, and most carts expire.

Across all of BC Parks on summer weekends the pattern holds, if more gently: 21.2% of openings are claimed within an hour. The same parks show up again and again: Jasper’s Whistlers and Banff’s Tunnel Mountain in the Rockies, Birds Hill in Manitoba, Balsam Lake and Earl Rowe in Ontario. Popular is popular, everywhere.

Banff is eleven campgrounds, and they don’t behave alike

Golden Ears and Cultus Lake are single campgrounds, so a park-level number means something there. Not every famous name works that way — and the bigger the name, the less it tends to mean.

Banff National Park is one place to a camper and eleven separately bookable campgrounds to a reservation system, from Tunnel Mountain above the townsite to Rampart Creek up the Icefields Parkway. We began watching Parks Canada on 8 June, so its share of this window is 23 days rather than 25. Over that stretch its weekend nights produced 12,744 re-bookings on 2,502 campsites. Of those, 32.5% landed within an hour of the campsite opening. That one average describes almost none of the eleven.

So the campground sets the pace and the destination name hides it. Watching all of Banff at once means watching a place where you have under two hours next to one where you have nearly two days.

What this means if you’re trying to book one

• Watch early in the week, and don’t bother picking an hour. Monday is the peak day and the 10-to-noon block the peak hours, but spots are taken as fast as they appear right through the day, so the hour you check changes far less than how quickly you move.
• Keep watching right up to your date. A weekend night’s openings cluster in the closing week before it, and the last three days are the likeliest of all.
• Be ready to move in minutes. At a hot park, a 15-minute head start is the difference between camping and not. If you miss one, keep watching: more grabs release again inside half an hour than stick.
• Name the campground, not the famous park. One destination can hold campgrounds at opposite ends of the range, so its average tells you nothing about the one you actually want.
• You can’t realistically do this by hand. Nobody can sit refreshing a booking page at 8 a.m. on a workday, across multiple parks, for weeks. That’s exactly the gap a watcher fills.

How we measured this

Averaging by weekday. The window runs Sunday 7 June to Monday 29 June, holding four Mondays and four Sundays against three of every other weekday. Each bar divides that weekday’s total by how many times it actually occurred, so the days are comparable. Raw totals were 57,460 Mon · 40,784 Tue · 37,818 Wed · 36,995 Thu · 34,837 Fri · 27,342 Sat · 42,120 Sun, summing to 277,356.

The time-of-day bands. Every band is two hours wide, so the bars are directly comparable. The nine shown cover 6 a.m. to midnight and hold 95% of cancellations; the other 5% fall between midnight and 6 a.m. Across timezones the late-morning peak ranges only from 20.5% to 24.4% of each zone’s cancellations.

Lead time. The seven Friday, Saturday and Sunday nights of 16–31 July, followed from 40 days out — a window fully observable for every night in the cohort, since fleet data begins 6 June. Openings are counted per day before the night, then averaged within each band. Times come from the broker-stamped publish clock, not the poller’s.

Clocks and coverage. Every opening is converted to its own park’s local time, so a 10 a.m. in Ontario and a 10 a.m. in British Columbia count as the same hour. Parks whose timezone we do not yet record sit out the hour-of-day charts, 6.4% of openings.

A note on the numbers: These come from our own live monitoring across the 25 days from 6 to 30 June 2026. Our pollers reached the whole fleet on 6 June, so the days before it are not a quiet month, they are days we were not yet watching everything, and we date the window to what we measured rather than to the calendar. “Openings detected” counts every booked-to-available transition our pollers saw: 832,495 of them, an average of about 33,300 a day (832,495 ÷ 25). Not every one is a prime summer-weekend site; the split by prior-booked duration, and the one-hour filter we use to tell a cancelled trip from an expired checkout cart, are in the section above.

The BC fast-grab figures are 11,797 weekend re-bookings at Golden Ears, Cultus Lake, and E. C. Manning specifically, and how fast an opening gets re-booked depends heavily on the park and the date. The lead-time figures are a separate slice: arrival nights of 16 to 31 July, each followed back 40 days, which is as far back as our monitoring reaches for every night in that set. One scope note: the 726 parks above are everything our pollers measured for this study, which is wider than the regions you can set an alert on today; the current watch list is on the pricing page.