Sheridan isn't a market that books out a year in advance the way Jackson Hole does — but it isn't wide open every weekend either. How much lead time you need depends almost entirely on what's happening in town that week.
Sheridan's highest-demand stretch. Outside of the two flagship weeks below, plan two to four weeks ahead for a good pick of cabins and downtown lofts; a week or two out, you'll still find something, just fewer choices.
Sheridan's two biggest compression events. Most experienced travelers plan six to twelve weeks ahead — the best properties are gone well before the week itself. If you're planning around either of these specifically, go straight to Wyo Stays' Rodeo Week page, which tracks actual availability rather than general guidance.
The best-kept secret in Sheridan lodging. Weather is still good, the Bighorns are turning color, and availability is wide open — one to two weeks ahead is usually plenty.
Quiet outside of the holidays. Christmas and New Year's week fills up two to four weeks out; the rest of winter, same-week booking is common.
Sheridan's true shoulder season — mud season on the ranches, quiet in town. Easiest time of year to book with almost no lead time, and often the best rates.
Sheridan's lodging supply is small relative to a destination like Jackson — a few hundred short-term rentals total across the county, not thousands — so a single big event can visibly tighten the market in a way it wouldn't in a bigger town. That's the whole story: it's not that Sheridan is generally hard to book, it's that a handful of specific weeks are, and the rest of the calendar is genuinely easy.