Campsite cancellation alerts: how they work, and what actually differs

Reservation systems publish availability, so a service polls that availability on a loop and compares it with the last look. When a stay you asked for goes from booked to bookable, it sends you a text, an email or a push notification with a link.

The whole game is the loop interval and what happens next. A service checking every few minutes will genuinely find you openings on quiet campgrounds; on a contested one it will reliably tell you about a site somebody else has already taken.

Between 2026-07-22 and 2026-09-04 we watched 502 hard-to-book campgrounds every hour and counted only genuine openings — a stay that had been fully booked becoming bookable again. It happened 1,100 times in 125,118 checks, about 0.9% of them.

Rare, in other words, and then gone quickly. That is why the interval is the specification worth reading and why “we check often” is not an answer. CampHawk checks every 15 seconds, continuously.

Recreation.gov has had its own availability alerts since 2024. They are free, they cover every reservable Recreation.gov location, and you are limited to a few active alerts at a time. If your trip is a Recreation.gov campground and you are happy to race everyone else to the booking page, start there. You should not pay for something the booking system gives away.

There are free tiers elsewhere in this category too. It is worth ten minutes to check whether one covers you before paying anybody, including us.

1. State reservation systems. Recreation.gov's alerts only cover Recreation.gov. A large share of the campgrounds people cannot book are on state systems — ReserveCalifornia above all, plus a dozen others — and those systems do not offer alerts of their own. CampHawk watches fourteen sources, and that is where most of what we find lives.
2. Doing something about it, not just telling you. An alert still requires you to be holding your phone. On Recreation.gov we can put the site in your cart for you — around twelve seconds from the opening appearing — and on ReserveCalifornia we can hold a site through the 8am release and hand it to you. Recreation.gov will never build that; it would be carting against itself.

• How often does it actually check, in seconds?
• Does it cover your reservation system, or only Recreation.gov?
• Can it handle flexible dates, or only one exact stay?
• Does it text you, or only email? An email at 3am is not an alert.
• Does it do anything beyond notifying you?
• Can you cancel in one click without emailing anybody?

Searching is free — you can check availability across all fourteen systems without an account. Find your campground, and if it is booked out, here is what actually works. Watching and alerts are paid; the plans are here.