Free Campsite Cancellation & Entry Permit Alerts

Get instant notifications when sold-out campsites become available. We monitor 41+ park systems across 37 states, including Recreation.gov and Yellowstone, plus timed-entry permits. Start free, then upgrade to Pro only if you want faster scans and higher limits.

Like CampNab and CampFlare, but with a free plan, optional Pro, 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.

2-minute Pro scans
Opening Bell Scan for Pro
4 alert channels
Free plan available

We Monitor 41+ Park Systems

Federal lands, state parks, and regional systems across 37 states

Recreation.gov

Recreation.gov

National Parks, Forests, BLM, COE

Yellowstone National Park

Yellowstone National Park

5 campgrounds

California State Parks

California State Parks

280+ parks

New York State Parks

New York State Parks

147 campgrounds

Ohio State Parks

Ohio State Parks

70+ parks

Minnesota State Parks

Minnesota State Parks

151 parks

Florida State Parks

Florida State Parks

146 parks

Missouri State Parks

Missouri State Parks

114 parks

Michigan State Parks

Michigan State Parks

189 parks

Pennsylvania State Parks

Pennsylvania State Parks

105 campgrounds

Texas Parks & Wildlife

Texas Parks & Wildlife

98 campgrounds

Washington State Parks

Washington State Parks

120+ parks

Arizona State Parks

Arizona State Parks

25+ parks

Virginia State Parks

Virginia State Parks

40+ parks

Oregon State Parks

Oregon State Parks

65 campgrounds

Wisconsin State Parks

Wisconsin State Parks

66 parks

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

Maryland State Parks

Maryland State Parks

75 parks

East Bay Regional Parks

East Bay Regional Parks

San Francisco Bay Area

Plus 17 More State Park Systems

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

Plus Oregon Metro and Fairfax County regional parks

150,000+
Campsites Monitored
41+
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

2 min

Pro Scan Speed

Pro alerts scan every two minutes; free alerts scan every 15

15s

Opening Bell Scan

Pro scans seconds after cancellations drop each morning

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.

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 Pro for faster scans and Opening Bell Scan 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.
Pro adds 2-minute scans and Opening Bell Scan for those key morning release windows, while the free plan still gives you a strong starting point.
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 150,000+ campsites across the country
  • Check for availability every 2 minutes, 24/7
  • 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

Free alerts scan every 15 minutes and Premium Supporter alerts scan every 2 minutes across 150,000+ campsites. When a reservation is cancelled and a site becomes available that matches your alert criteria, we notify you by SMS, email, push, or in-app alert so you can book it before anyone else.
Yes. Free accounts get 1 active campground alert with 15-minute scans and full SMS, email, push, and in-app notifications. Premium Supporters can upgrade to 5 alerts with faster 2-minute scans, Opening Bell Scan, and an ad-free experience for $4.99/month or $49.99/year. Need even more? Purchase additional alert packs anytime.
We monitor all campgrounds on Recreation.gov (national parks, national forests, BLM lands, Army Corps of Engineers) plus state park systems including ReserveCalifornia, ReserveAmerica, and many others. This includes popular destinations like Yosemite, Joshua Tree, Big Sur, Yellowstone, Zion, Grand Canyon, and thousands more.
Our system scans for availability every 2 minutes and sends notifications within 30 seconds of detecting an opening. This speed is critical because popular campsites at places like Yosemite or Big Sur often get rebooked within minutes of a cancellation.
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 150,000+ 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.

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