Camping Reservation Glossary: Booking Window, Lead Time, Occupancy & More

Campsite Odds describes every campground using a small, consistent vocabulary — booking window, lead time, sellout speed, occupancy, and weekend premium — that together produce the 1–10 score shown on every page. This glossary defines each term in plain English, with links to see it in action.

Key takeaways

• The 1–10 score blends four signals: lead time, sellout speed at window-open, occupancy, and weekend premium.
• Every score also gets a plain-English label: Easy, Plan ahead, Hard, or Lottery-hard.
• Most Recreation.gov campgrounds open reservations on a rolling booking window, though the exact window length and release time vary by campground.
• Recent booking history counts more than older history, so a score reflects current demand rather than a single unusual season.

Glossary

Nine terms show up across nearly every Campsite Odds page. Here is what each one means:

Booking-difficulty score

The core number on every campground/month page, from 1 (easiest) to 10 (hardest). It is a weighted blend of the four signals below, computed from that campground’s actual reservation history — never a guess or an editorial opinion. See the Methodology page for exactly how the pieces are weighted.

Odds label

The plain-English name attached to a score: 1–3 is Easy, 4–6 is Plan ahead, 7–9 is Hard, and 10 is Lottery-hard. The label is what you will see on badges and cards across the site; the number is what you will see if you click into a specific month. What Campsite Odds’ Booking-Difficulty Score Actually Means walks through how the two relate.

Booking window

The stretch of time during which a campground accepts reservations before an arrival date — commonly a rolling number of months out, with new dates released at a set time each day. The exact window length and release time are set per campground, not sitewide. How Recreation.gov’s Booking Window Actually Works covers the mechanics in detail.

Lead time

The typical number of days between when a reservation was made and the arrival date it was made for. A high median lead time is a tell that people are booking the moment the window opens rather than waiting. Watchman Campground in Zion National Park is a useful example — check its July page to see a lead-time pattern in a consistently competitive campground. How to Read a Campground’s Lead-Time Chart breaks the chart down.

Sellout speed

A separate badge describing how fast a month’s dates get claimed once the booking window opens: gone at open, gone within days, filling over weeks, or rarely selling out at all. It is related to the score but answers a slightly different question — not just how hard a month is, but how much warning you will have. The 4 Campsite Sellout Speeds, Explained covers each speed.

Occupancy

How full a campground actually ran during a given month, based on nights that were booked out of nights available. High occupancy in past years is one of the four inputs to that month’s score, alongside lead time, sellout speed, and weekend premium.

Weekend premium

How much harder a campground’s weekend nights are to book than its weekday nights, historically. A large weekend premium means arriving on a Tuesday can be a realistic option even when Friday and Saturday are booked solid. Why Weekends Book Faster Than Weekdays digs into the pattern.

Recency weighting

Campsite Odds blends up to three fiscal years of reservation history into each score, but does not treat them equally — the most recent year counts for roughly half of the blend, with the two years before it tapering off. That keeps a score reflecting current demand instead of getting stuck on an unusual season from a few years back.

Minimum data threshold ("no thin pages")

A campground only earns a score for a given month once there is enough real reservation history behind it. Below that bar, the month simply has no page — Campsite Odds would rather publish nothing than a number it cannot stand behind. How Much Reservation Data It Takes to Trust an Odds Score and the data sources page explain where that history comes from.

Frequently asked questions

Do all of these terms apply to every campground?

Only where there is enough data. A campground/month with too little reservation history will not have a score, a label, or a sellout-speed badge — it simply will not have a page at all, per the minimum data threshold above.

Where can I see these terms in action?

Any campground page ties all of them together in one place. Mather Campground in Grand Canyon National Park is a good one to explore, since its difficulty shifts noticeably from season to season.

Is a "Hard" label the same everywhere?

Yes — the same 1–10 thresholds and labels are used for every campground and every month, so a Hard label at a small state-park campground means the same thing as a Hard label at a national-park icon: both landed in the same 7–9 range on the same scale.

What is the difference between the score and the label?

The score is the precise 1–10 number; the label is the plain-English bucket it falls into. Two campgrounds with scores of 7 and 9 both show "Hard," even though 9 is meaningfully more competitive than 7 — worth clicking through to the number itself if you are comparing two close options.