When Do Campground Reservations Open? 2026 Booking Windows for Every Major System

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: Recreation.gov enforces a rolling 18-day stay limit per area. Book 14 days at one campground and you can't book the same area again for 18 days after checkout. Plan accordingly if you're doing 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 doesn't do rolling windows. It opens ALL summer reservations on a single date in late March or early April. The exact date gets announced in February. Full Yellowstone booking guide here.

Release time: 8:00 AM Mountain Time on the annual release date.

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'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, Arizona, Virginia, Minnesota, Missouri, Oregon, Tennessee, South Carolina, 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 10,000+ campgrounds across 40 park systems every 2 minutes. When someone cancels, you get a text or email before the site disappears again.

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.

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: Single release date (late March/early April), 8 AM MT

Florida: 11 months, rolling daily

Wisconsin: 11 months, rolling daily

Washington: 9 months (GoingToCamp)

Michigan, Ohio, Arizona, Virginia, Maryland, Minnesota, Missouri, Oregon, Tennessee: 6 months

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.