Free Campsite Cancellation & Entry Permit Alerts

Get instant notifications when sold-out campsites become available. We monitor 44 reservation systems across all 50 states, including Recreation.gov and Yellowstone, plus timed-entry permits. Start free, with free push alerts on the iOS and Android apps, then upgrade only if you want faster scans and higher limits.

Like CampNab and CampFlare, but with a free plan, optional paid tiers, and no booking markup. We don't book for you. We notify you the moment a spot opens so you can book it yourself on the official site.

Priority paid scans (1–2 min)
Smart timing during peak windows
4 alert channels
Free plan available

We Monitor 54+ Park Systems

Federal lands, state parks, and regional systems across 41 states

Recreation.gov

Recreation.gov

National Parks, Forests, BLM, COE

Yellowstone National Park

Yellowstone National Park

5 campgrounds

California State Parks

California State Parks

264 campgrounds

New York State Parks

New York State Parks

147 campgrounds

Ohio State Parks

Ohio State Parks

88 campgrounds

Minnesota State Parks

Minnesota State Parks

301 campgrounds

Florida State Parks

Florida State Parks

159 campgrounds

Missouri State Parks

Missouri State Parks

131 campgrounds

Michigan State Parks

Michigan State Parks

192 campgrounds

Pennsylvania State Parks

Pennsylvania State Parks

105 campgrounds

Texas Parks & Wildlife

Texas Parks & Wildlife

98 campgrounds

Washington State Parks

Washington State Parks

83 campgrounds

Arizona State Parks

Arizona State Parks

49 campgrounds

Virginia State Parks

Virginia State Parks

31 campgrounds

Oregon State Parks

Oregon State Parks

65 campgrounds

Wisconsin State Parks

Wisconsin State Parks

50 campgrounds

Tennessee State Parks

Tennessee State Parks

36 campgrounds

South Carolina State Parks

South Carolina State Parks

35 campgrounds

Idaho State Parks

Idaho State Parks

23 campgrounds

Alabama State Parks

Alabama State Parks

18 campgrounds

North Dakota State Parks

North Dakota State Parks

14 campgrounds

Maryland State Parks

Maryland State Parks

22 campgrounds

Nevada State Parks

Nevada State Parks

20 campgrounds

Arkansas State Parks

Arkansas State Parks

32 campgrounds

Colorado State Parks

39 campgrounds

Vista Recreation

20 campgrounds at TVA & LCRA lakes

Vermont State Parks

Vermont State Parks

43 campgrounds

South Dakota State Parks

55 campgrounds

Illinois State Parks

57 campgrounds

West Virginia State Parks

27 campgrounds

Louisiana State Parks

21 campgrounds

Mississippi State Parks

19 campgrounds

New Jersey State Parks

17 campgrounds

Hawaii State Parks

13 campgrounds

Maine State Parks

12 campgrounds

Wyoming State Parks

10 campgrounds

East Bay Regional Parks

East Bay Regional Parks

San Francisco Bay Area

PG&E Recreation

PG&E Recreation

30 campgrounds in California

Plus 16 More State Park Systems

Iowa · Massachusetts · Georgia · Indiana · North Carolina · Utah · Alaska · New Mexico · Nebraska · Kentucky · New Hampshire · Kansas · Montana · Connecticut · Delaware · Rhode Island

Plus Oregon Metro, Fairfax County, county parks across California, Washington, and Oregon, and PG&E Recreation areas

263,000+
Campsites Monitored
54+
Park Systems
Every 2 Min
Availability Checks

Why Speed Matters

Campsites Disappear Fast

When a cancellation opens up a prime campsite, you have minutes — sometimes seconds — before someone else books it. Our alerts give you the edge.

47%

Cancellation Rate

Nearly half of campsite reservations get cancelled

10K+

Campers Competing

Thousands watch the same popular campgrounds

1–2 min

Paid Scan Speed

Paid alerts scan every 1–2 minutes; free alerts scan every 5–15 minutes depending on time of day

60s

Peak-Window Priority

Paid plans scan as fast as 60 seconds during known cancellation windows like the 4 PM ET Recreation.gov cutoff

Our job is to find the opening and notify you instantly. Your job is to book it on the official site.

How our campground availability alerts work

We do the watching. You do the booking. Here's how our free campground availability and campsite cancellation alerts help you land sold-out campgrounds on Recreation.gov and state park systems.

1. Choose a Campground

Select the campground you want to visit. We support Recreation.gov and many state park systems.

2. Set Your Dates

Tell us when you want to camp. We'll start monitoring availability for those specific dates.

3. Get Notified Instantly

When a site opens up, we'll alert you via email, SMS, or push notification within seconds.

4. Book It Yourself

Click the link in your alert to go directly to the booking page. You complete the reservation on the official site.

Remember: We notify you of availability, but you book directly through the official reservation system. No middleman, no extra fees.

Can’t decide between campgrounds? Watch them all.

A group watch covers up to 8 campgrounds for the same dates. The first one to open up wins — you get the booking link, the others stand down, and it all counts as just one alert.

Pick your maybes

Choose up to 8 campgrounds you’d be happy with — any mix of parks and reservation systems.

First to open wins

The moment any of them has a site for your dates, we notify you with the booking link — and quiet the rest so you aren’t flooded.

One alert slot

The whole group counts as a single alert against your plan — watching 5 campgrounds no longer costs 5 slots.

Set one up by asking Camp Sage (“watch Upper Pines or anywhere near Yosemite for August 12–15”), or save campgrounds as a trip and tap “Watch these sites.” Not sure where’s hardest to get? See the Sellout Index.

Campground availability alerts across Recreation.gov and 13 state and regional systems

Outdoorithm helps you catch sold-out sites before someone else does. Start with a free alert, or upgrade to a paid plan for priority scans (every 1–2 minutes, faster during peak cancellation windows) on the campgrounds that matter most.

Instant campground cancellation alerts for top destinations including Yosemite, Yellowstone, Zion, Big Sur, and Lake Tahoe.
Alerts cover Recreation.gov plus 13 state and regional systems, with SMS, email, push, and in-app notifications so you can move fast when a matching site opens.
Paid plans add priority scans (every 1–2 minutes; as fast as 60 sec during peak cancellation windows) while the free plan still gives you a strong starting point with smart scanning.
You always book directly on the official reservation site. No booking markup, no middleman, and no bot that takes control of the checkout from you.

Popular Camping Destinations

Set up free alerts for the most popular campgrounds in the country. Get notified when cancellations open up your perfect spot.

National & State Parks

YosemiteCalifornia
YellowstoneWyoming
Grand CanyonArizona
ZionUtah
Joshua TreeCalifornia
Big SurCalifornia
Lake TahoeCalifornia
Rocky MountainOlympicGlacierMount RainierView All Parks →

Alerts by State

CA
California280+ state parks
CO
Colorado42+ state parks
TX
Texas89+ state parks
WA
Washington124+ state parks
OR
Oregon254+ state parks
Learn strategies for booking sold-out campgrounds
What We Do (And Don't Do)

We're Your Lookout, Not Your Booking Agent

Outdoorithm is a notification service. We monitor campground availability and alert you when spots open up. The actual booking? That's all you.

OutdoorithmMonitors & alerts
YouBook the campsite
Recreation.govOfficial booking

What Outdoorithm Does

  • Monitor 263,000+ campsites across the country
  • Smart-timed scans 24/7 — faster during peak cancellation windows
  • Send instant alerts via email, SMS, or push notification
  • Include a direct link to the booking page in every alert

What Outdoorithm Does NOT Do

  • Make reservations on your behalf
  • Hold or reserve campsites for you
  • Charge booking fees or commissions
  • Guarantee you'll get the site (speed matters!)

Think of us as your 24/7 campsite spotter. When opportunity knocks, we make sure you hear it — but you're the one who answers the door.

Booking Calculator

Popular campgrounds open reservations months in advance. Our Booking Calculator tells you exactly when reservations open so you can be ready the moment the window unlocks.

  • Know your booking window

    Find out exactly when reservations open for your trip dates

  • Set your alarm

    Get calendar reminders so you never miss opening day

Booking Window

Yosemite National Park

Reservations Open
6 months before arrival
Most rolling-window campgrounds follow this pattern
Release time
7:00 AM PT
What to do
Set a reminder

Frequently asked questions

Our system continuously monitors campground availability across 263,000+ campsites and notifies you the moment a site matching your criteria becomes available. Free accounts scan every 5–15 minutes (60 seconds during peak cancellation windows). Paid plans scan every 1–2 minutes, with 60-second scans during peak windows. Notifications go out via email, push, in-app, and (on paid plans) SMS within 30 seconds of detection.
Yes. Free accounts get 1 active campground alert with smart scanning (5–15 min normally, 60 seconds during peak windows) and email + push notifications. Premium Supporter ($12.99/month or $129/year) gets 5 alerts, 2-minute scans (60s during peak), SMS notifications (capped at 100/month), and 100 Camp Sage AI messages per month. Power Camper ($19/month or $189/year) gets 12 alerts, sub-60-second peak-window scanning, unlimited SMS, and 500 Camp Sage AI messages per month.
We watch 6,500+ reservable campgrounds across 44 reservation systems in all 50 states. That includes Recreation.gov (national parks, national forests, BLM lands, Army Corps of Engineers), ReserveCalifornia, ReserveAmerica, and many more, plus county and regional parks across California, Washington, and Oregon, and popular destinations like Yosemite, Joshua Tree, Big Sur, Yellowstone, Zion, and Grand Canyon. We've delivered 41,000+ availability notifications and counting, and we add new reservation systems every few weeks.
Yes. The free Outdoorithm app for iOS and Android sends a push notification the moment a matching campsite opens up, at no cost on any plan. Prefer email? Free accounts get email and push notifications without an app.
It depends on the time of day and your plan. We've learned that most cancellations cluster around predictable times — for example, Recreation.gov processes unpaid reservation cancellations right after the 4 PM ET cutoff each day, releasing a flood of available sites in seconds. Our system scans more frequently during these "drop windows" and conserves resources during quieter periods. Paid plans scan as fast as every 60 seconds during drop windows; free plans scan as fast as every 5 minutes. Notifications go out within 30 seconds of detection. A note on overnight hours: most cancellations happen during waking hours, so we scan less aggressively from 9 PM to 6 AM Pacific. If a site drops at 3 AM, you'll still get the notification — just within ~15–30 minutes rather than seconds. Most users would be asleep anyway.
Yes. Most campgrounds (Recreation.gov, ReserveCalifornia, ReserveAmerica, and most county/state parks) get the smart-polling cadence above — fast during peak cancellation windows, slower overnight. A small group of campgrounds run on reservation systems that take substantially longer per check than typical providers. Rather than burn through alert costs running these every two minutes, we check them on a slower fixed cadence: roughly every 4 hours on Power Camper, every 8 hours on Premium Supporter, and once a day on Free. This currently affects San Mateo County Parks (including Memorial Park), Sonoma County Parks, Idaho State Parks, and Alabama State Parks; Yellowstone gets a milder slowdown (every 2–6 hours). When you set up an alert for one of these campgrounds, the alert wizard tells you the actual cadence you'll get before you commit. Most cancellations at these parks are still caught within the cadence window — they're just not as last-minute as Recreation.gov alerts.
No, we don't book campsites for you. When we detect availability, we send you an alert with a direct link to the official reservation site (Recreation.gov or the park's booking system). You complete the booking yourself - no middleman, no extra fees, no markup.
Outdoorithm lets you start free, then upgrade only if you want faster scans and higher limits. We monitor 263,000+ campsites and offer SMS, email, push, and in-app notifications while keeping you on the official booking system.
Set up alerts early and be flexible with your dates (weekdays have more cancellations). Be ready to book immediately when you receive a notification - have your Recreation.gov account logged in and payment info saved. Most cancellations happen 1-2 weeks before the reservation date. Setting alerts for multiple campgrounds increases your chances.
You can set alerts for entire campgrounds or filter by specific criteria like site type (tent, RV, cabin), amenities, or loop. This lets you target exactly the kind of campsite you're looking for rather than getting notifications for sites that don't meet your needs.
Recreation.gov reservations typically open at 7:00 AM Pacific Time (10:00 AM Eastern), 6 months in advance on a rolling basis. ReserveCalifornia reservations open at 8:00 AM Pacific Time, also 6 months in advance. Use our free booking window calculator to find the exact release date for your target campground and set alerts for both new releases and cancellations.
Yes, using campsite availability alerts is completely legal. We simply monitor publicly available information on Recreation.gov and state park booking systems, then notify you when availability changes. You still book directly through the official reservation sites using your own account. We don't bypass any systems or make bookings on your behalf.

Get alerts on your phone, free

Download the free Outdoorithm app for iOS or Android and get a push notification the second a campsite opens up. No subscription required.

Outdoorithm on the App StoreOutdoorithm on Google Play

Ready to stop missing out on perfect campsites?

Set up your free alerts today. We'll watch for openings and notify you the moment a spot becomes available. You handle the booking on the official site.

No credit card required
Set up in under a minute
SMS + email + push + in-app
48-hour money-back guarantee