The 4 Campsite Sellout Speeds, Explained
Every campground/month page on Campsite Odds shows two signals side by side: a 1-10 difficulty score and a sellout-speed badge. The score ranks how hard a site is relative to other campgrounds that month. The badge tells you something different — exactly when to act — and there are four of them.
Key takeaways:
- Sellout speed and the 1-10 difficulty score are two different signals — the score ranks relative difficulty across campgrounds, while the badge describes this campground's own booking curve. See What Campsite Odds' Booking-Difficulty Score Actually Means for how the score itself works.
- There are exactly four badges: "Sells out at open," "Sells out in days," "Fills in weeks," and "Rarely sells out."
- "Sells out at open" and "Sells out in days" are both about what happens the instant the booking window opens — the split is 40%+ versus 15-40% of a month's reservations landing right at open.
- "Fills in weeks" is a lead-time pattern, not a window-open rush — pair it with How to Read a Campground's Lead-Time Chart to see the shape of the curve for yourself.
- Every badge is shown next to "Based on N years of reservation data" — check that number before treating a badge as gospel; a badge built on one year of history carries a lot less weight than one built on three.
"Sells out at open"
This badge appears when 40% or more of a month's reservations land in the exact instant the booking window opens. The page spells it out with a line like this: "{Month} weekends are typically gone within minutes of the booking window opening." If you see this badge, there's no such thing as booking "a little late" — you need to be logged into Recreation.gov with your exact dates selected before the window opens, and you need to stay at your screen, not step away for coffee, the second it does.
See How Recreation.gov's Booking Window Actually Works for exactly when that window opens for a given campground. Weekend dates are almost always the first casualty in that rush — see Why Weekends Book Faster Than Weekdays for why weekday dates tend to hang on a little longer even under this badge.
"Sells out in days"
This badge shows up when 15-40% of a month's reservations happen right at window-open — enough to matter, but not an instant sellout. The page copy: "Popular {Month} dates usually sell out within a few days of release." You don't have to be logged in the second the window opens, but you can't wait a week either. Try to book within the first 48-72 hours after release, and if you miss that window, keep checking back — cancellations trickle in during those same first few days too.
"Fills in weeks"
This one isn't about window-open at all — it's triggered when the median booking lead time is at least half the campground's booking window (90-plus days ahead for a typical 6-month window). The page copy: "{Month} dates tend to fill up in the weeks before arrival." That gives you real room to plan: book a few weeks to a couple of months out rather than racing the clock on release day, and use the campground's own lead-time chart to see roughly how far ahead bookings typically land.
"Rarely sells out"
This is the default, calmest case — the badge you'll see when a campground doesn't fit any of the other three patterns. The page copy: "{Month} rarely sells out — you can often book close to your trip." There's no need to set an alarm for window-open or lock in dates months ahead; you can wait until your plans firm up and still book close to your trip. For a broader list of campgrounds that behave this way in a given month, browse the easy-to-book pages for that month.
The four badges, side by side
- "Sells out at open" — 40%+ of reservations land at window-open — be logged in, dates ready, and don't step away when the window opens.
- "Sells out in days" — 15-40% of reservations land at window-open — book within the first 48-72 hours; watch for cancellations if you miss it.
- "Fills in weeks" — median lead time is at least half the booking window — book a few weeks to a couple of months ahead; no need to race window-open.
- "Rarely sells out" — the default, calmest pattern — book whenever your plans firm up, even close to your trip.
What this looks like on real campground pages
Badges aren't guesses — they're computed from actual reservation history, and they can look different from what you'd assume. High-demand summer basecamps like Upper Pines Campground in Yosemite or Watchman Campground in Zion are the kind of places where a "sells out at open" or "sells out in days" badge tends to show up in peak months — but open either page for the month you care about and check the actual badge rather than assuming. A less iconic pick like Moraine Park Campground in Rocky Mountain National Park might show a calmer pattern in shoulder-season months. The point isn't to memorize which campground gets which badge — it's to check before you plan your booking morning around one that might not apply.
None of these badges are predictions — they're patterns pulled from real reservation history, computed the same way for every campground on the site. Read more about how that pipeline works on About Campsite Odds.
Frequently asked questions
Does a fast sellout speed mean a campground is hard to get overall?
Not necessarily. Sellout speed and the 1-10 difficulty score measure different things — the score compares this campground against every other campground that month, while the badge only describes its own booking curve. A campground can carry a mid-range score and still "sell out at open" if its limited sites disappear fast, even though plenty of easier alternatives exist elsewhere that same month.
Can a campground's sellout speed change from month to month?
Yes. Badges are computed separately for each campground/month combination, so the same campground can "sell out at open" in July and "rarely sell out" in October. Always check the badge for the specific month you're planning to book — the badge on a campground's page reflects that one month, not an average across the year.
What does "Fills in weeks" actually measure, if not window-open demand?
It's based on lead time, not window-open share. If the median reservation for that campground/month is made at least halfway through the booking window — 90-plus days ahead for a 6-month window — the campground earns this badge. That means bookings arrive steadily over time rather than in a rush, so you have more flexibility than a window-open badge implies.
How much should I trust a badge if a campground only has one year of data?
Less than one built on three. Every badge is shown next to "Based on N years of reservation data," and the model merges up to three fiscal years, recency-weighted, when they're available. A badge backed by a single unusual year is more likely to shift once more data comes in — see How Much Reservation Data It Takes to Trust an Odds Score for how that weighting works.
I missed the booking window on a "sells out at open" campground — is it really over?
Not necessarily. Even fast-selling campgrounds see cancellations, and some of those slots open back up closer to the trip date. It's worth checking back rather than writing the trip off entirely — see What Happens to Cancelled Campsites (and How to Get One) for how to catch one when it opens up.
Do lottery campgrounds get sellout-speed badges the same way as first-come, first-served ones?
The badge logic runs the same way for every campground with enough reservation history, but lottery systems create a different booking rhythm than a single window-open moment. If you're not sure whether a park you're eyeing uses a lottery, see Camping Lottery vs. First-Come, First-Served for how the two systems differ.