When to plant in Sheridan, WY
USDA Zone 5aSheridan, Wyoming frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 5a means Sheridan sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
SHERIDAN CO AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Sheridan’s own odds, recorded at SHERIDAN CO AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 19 | Jun 4 | May 21 | Aug 30 | Sep 13 | Sep 25 |
| 32°F | Jun 6 | May 21 | May 7 | Sep 9 | Sep 23 | Oct 6 |
| 28°F | May 22 | May 7 | Apr 25 | Sep 20 | Oct 3 | Oct 17 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Sheridan, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Sheridan planting FAQ
When is the last spring frost in Sheridan, WY?
Sheridan's average last spring frost falls near May 21 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Sheridan, WY?
The first fall frost in Sheridan typically arrives around September 23 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Sheridan in?
Sheridan is in USDA hardiness zone 5a. In zone 5a, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Sheridan?
There are roughly 125 frost-free days in Sheridan (a short growing season), running from the average last frost around May 21 to the first fall frost near September 23.
When should I plant tomatoes in Sheridan?
In Sheridan, start tomato seeds indoors around March 26–April 9, then transplant seedlings outdoors around May 28 once the danger of frost has passed.
Never miss a window in Sheridan
An email when it’s time to start seeds, transplant, and sow — timed to Sheridan’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at SHERIDAN CO AP, 3 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Sheridan, WY — Frost Dates & Zone 5a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024029. Retrieved from https://blissgarden.com/wyoming/sheridan.