When Do Campground Reservations Open in 2026? Every Window

7:55 AM on a Tuesday. Coffee barely warm. Justin has three browser tabs open: ReserveCalifornia on one, Recreation.gov on another, his phone timer counting down on the third. In five minutes, six months of Pfeiffer Big Sur availability will appear. He's done this exact routine maybe forty times.

Sometimes he gets the site. Sometimes he doesn't. But after 381 campground reservations across five different booking platforms, one thing is clear: knowing exactly when reservations open is half the battle.

Here's every booking window you need for 2026.

The Two Systems That Matter Most

If you camp anywhere in America, you'll deal with at least one of these two. Together they cover about 4,500 campgrounds.

Recreation.gov (Federal Lands)

Booking window: 6 months in advance, rolling daily. Full Recreation.gov booking guide here.

Release time: 10:00 AM Eastern Time. Every single day.

This covers National Parks, National Forests, BLM lands, Army Corps of Engineers sites, and National Monuments. Yosemite, Yellowstone backcountry permits, Grand Canyon, Olympic, Joshua Tree. If it's federal, it's here.

The math is simple. Want a July 4th site at Yosemite? You need to be online at 10:00 AM ET on January 4th. Want Labor Day weekend? Mark 6 months back and set your alarm.

One catch: most Recreation.gov campgrounds cap you at 14 nights in any 30-day stretch, and the exact limit varies by campground and season. Separately, the book-and-trim move has its own rule: if you book a long stay that reaches past the window to grab an early date, you're locked out of rebooking that same span for 18 days. Plan accordingly if you're stringing together extended trips.

ReserveCalifornia (California State Parks)

Booking window: 6 months in advance, rolling daily. Full ReserveCalifornia booking guide here.

Release time: 8:00 AM Pacific Time.

California has 39 million people and 280 state park campgrounds. Do the math. Coastal spots like Pfeiffer Big Sur and Kirk Creek sell out within seconds of the window opening. We've made 25 reservations at Pfeiffer Big Sur alone. Six trips actually happened.

The ReserveCalifornia window is two hours earlier than Recreation.gov if you're on the West Coast. 8 AM versus 7 AM (Recreation.gov in Pacific time). You can hit both in the same morning.

Yellowstone: The One-Day Rush

Yellowstone releases its campground dates on a rolling monthly schedule. On the 5th of each month, the same month one year out opens up, so you can book roughly 13 months ahead. One change worth knowing: for the 2027 season, Yellowstone's campgrounds move to Recreation.gov, which runs closer to a 6-month window. Full Yellowstone booking guide here.

Release time: midnight Mountain Time online (or 7 AM Mountain by phone), on the 5th of each month.

Five reservable campgrounds: Bridge Bay, Canyon, Grant Village, Madison, and Fishing Bridge RV Park. Madison sells out first because of its location near Old Faithful. Canyon is a solid backup with more sites.

If you miss the rush, Yellowstone has 7 first-come-first-served campgrounds. Mammoth Hot Springs is open year-round. In summer, get there before 8 AM.

State Park Systems: The Full Breakdown

Every state runs its own reservation platform with its own rules. Here's the cheat sheet.

11-Month Window (Book Almost a Year Out)

Florida State Parks and Wisconsin State Parks both open 11 months ahead (Florida gives residents the full 11 months, non-residents 10). Florida's snowbird season (November through March) means beach campgrounds sell out almost a year in advance. Florida booking guide.

9-Month Window

Washington State Parks (via GoingToCamp) opens 9 months in advance. Olympic Peninsula and San Juan Islands parks book up first. Deception Pass is the most visited state park in Washington. GoingToCamp booking guide.

6-Month Window

This is the most common window. Michigan, Maryland, Ohio, Oregon, Tennessee, South Carolina, Colorado, and most other state systems open 6 months out. Ohio booking guide.

What Happens When You Miss the Window

You will miss it. We all do. The question is what you do next.

Here's what our family's booking data actually shows: of our 381 total campground reservations, 233 were cancelled. That's a 61% cancellation rate. And it's not because we're flaky. It's because getting a campsite at California's most popular parks is a numbers game.

Those cancellations happen everywhere, not just in our household. Every popular campground has a steady stream of people changing plans, consolidating bookings, or adjusting dates. That cancelled site becomes available for someone else.

Which is where cancellation alerts come in. Outdoorithm monitors 6,500+ reservable campgrounds across 44 reservation systems, around the clock. Set a free alert with your email, no account needed, and we'll email you the moment a site opens back up.

The biggest wave of cancellations hits 10 to 14 days before check-in. That's when people finalize vacation plans and let go of their backup reservations. If your target campground shows "sold out" right now, that doesn't mean it will be sold out on your arrival date.

Missing the window isn't the end of it. We've camped Pfeiffer Big Sur and Kirk Creek in peak season by watching for cancellations, and we wrote up exactly how we book sold-out campgrounds. For the hardest reservation in the country, here's how the Yosemite booking system works in 2026. And if you're aiming for a holiday weekend, the Labor Day camping playbook is its own animal.

The Quick Reference

Bookmark this. You'll come back to it.

Recreation.gov: 6 months, 10 AM ET, rolling daily

ReserveCalifornia: 6 months, 8 AM PT, rolling daily

Yellowstone: Rolling monthly on the 5th, up to ~13 months out, midnight MT (moves to Recreation.gov for 2027)

Florida: 11 months, rolling daily

Wisconsin: 11 months, rolling daily

Washington: 9 months (GoingToCamp)

Michigan, Ohio, Maryland, Oregon, Tennessee, Colorado: 6 months

Missouri: 12 months, 7 AM CT, rolling daily

Arizona: about 12 months, rolling daily

Virginia: 11 months, 8 AM ET, rolling daily

Minnesota: 120 days (about 4 months), 8 AM CT, rolling daily

Texas: 5 months, 8 AM CT, rolling daily

Two More Tools for Your Booking Morning

Our When to Book calculator will tell you the exact date to set your alarm for any specific campground. And our complete campground booking guide covers strategies beyond the booking window, including the book-and-trim trick, sliding modifications, and the cancellation playbook.

For detailed guides on each system, visit our booking guides hub.

Justin still has three tabs open on booking mornings. But these days, he also has Outdoorithm running in the background. The window matters. What you do after the window matters more.

Frequently Asked Questions

When do Recreation.gov reservations open?

Recreation.gov releases reservations six months ahead on a rolling daily basis, at 7:00 a.m. Pacific (10:00 a.m. Eastern). So for a July 15 trip, the window opens January 15 at 7:00 a.m. Pacific. A few high-demand parks, like Yosemite, run on their own special schedules.

When do ReserveCalifornia reservations open?

ReserveCalifornia (California State Parks) opens six months ahead at 8:00 a.m. Pacific, on a rolling daily window, so new dates become bookable every morning.

What time of day do campground reservations open?

Most systems release new dates first thing in the morning in their home time zone: 7:00 a.m. Pacific for Recreation.gov, 8:00 a.m. Pacific for ReserveCalifornia. Be logged in with your payment details saved a few minutes early, because the most popular sites can sell out within seconds of release.

What if my dates are already sold out?

Don't give up. Cancellations happen constantly. Set a free cancellation alert and we'll tell you the moment a matching site opens back up. We watch 6,500+ reservable campgrounds across 44 reservation systems and have delivered 41,000+ availability notifications and counting.

Can I get notified when a sold-out campsite opens up?

Yes, and it's free. Set up a cancellation alert and you'll get an email or push notification the instant a site that matches your dates frees up. The free Outdoorithm app for iOS and Android delivers those push notifications at no cost.