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Which Watchman sites actually have afternoon shade?

By Lucas Kim · All 184 sites · Figures for mid-July

Every guide to Watchman tells you to look for shade. None of them tell you which numbered sites have it, because Recreation.gov doesn’t publish that and nobody has walked all 184 pads with a stopwatch.

So I computed it — the hour the sun reaches each site and the hour it leaves, for every site in the campground.

Start with the honest part: the spread is three hours

Across all 184 sites, July sun runs from 8.0 hours at the shadiest to 11.0 at the most exposed. That is a real difference — three hours of July sun in Zion is the difference between a bearable afternoon and hiding in the car — but it is not the night-and-day gap some campgrounds have.

The reason is the canyon itself. The Watchman formation and the walls above the Virgin River cut the sun off for everyone in the early evening; almost no site here bakes until sunset. What varies is when your morning starts and how much of the late afternoon you keep.

Loop D has both the best site and one of the worst

This is the part that surprised me. Loop D averages the least sun of any loop, and it holds the shadiest site in the campground — D18, sun 10 AM to 6 PM. It also holds D10, which runs 8:30 AM to 7:30 PM. Same loop, three hours apart.

So “book Loop D” — the advice you will read everywhere — is right on average and can still hand you one of the sunniest pads at Watchman. The loop is not the unit that matters. The number is.

The shadiest sites

Six of the eight shadiest sites in the campground are in Loop D. If you are camping Zion in July with kids, a dog, or a tent that turns into an oven, these are the numbers to want.

The most exposed

These start around 8 or 8:30 in the morning and hold the sun until 7 or 7:30 in the evening. In April or October that is pleasant. In July it is the reason people leave early.

By loop, if you only get to pick a loop

The loop averages sit within about an hour of each other, which is another way of saying loop choice is weak information. D is the best bet and F the worst, but a good site in F beats a bad site in D.

What to do on booking morning

1. Have numbers ready, not a loop. Watchman opens six months ahead and the good sites go in minutes. Decide before you are under time pressure.
2. Rank three, not one. D18, then D17, then D13 — you will rarely get your first choice.
3. In shoulder season, invert this. In November the canyon takes the sun early and a site like F16 is the warm one. The list above is a July list.
4. Check your own dates. These figures are mid-July; the site pages let you move the date and the time.

How this was computed, and where it is weak

For each site I build a horizon profile in 180 directions — terrain out to 16 km from elevation data, plus tree canopy — and step the sun’s real position across it in 15-minute intervals, for the 15th of every month.

• The canyon walls are the reliable part.Terrain doesn’t move, and at Watchman the terrain is doing most of the work. That is why I trust these figures more than the ones for a dense-forest campground.
• The cottonwoods are the weak part.Tree data is a 10 m satellite product, and Watchman’s cottonwoods shade some pads and not their neighbours at a scale finer than that. Trust the ranking more than the exact minute.
• Clear sky only. No weather, no cloud.

If you camp one of these and the sun behaved differently, tell me which site — that is the only way this gets more accurate.

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