When to plant in Evanston, WY
USDA Zone 5aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Evanston, Wyoming — all computed from Evanston's nearest NOAA weather station.
Evanston's growing season is short at roughly 92 days, so succession planting is limited; lean on transplants over direct sowing for anything slow to mature. In zone 5a, Evanston gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
EVANSTON 1 E · 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 Evanston’s own odds, recorded at EVANSTON 1 E.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 32°F | Jul 2 | Jun 12 | May 26 | Aug 26 | Sep 12 | Sep 25 |
| 28°F | Jun 14 | May 24 | May 5 | Sep 7 | Sep 24 | Oct 9 |
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 Evanston, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 48 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.
Evanston planting FAQ
When is the last spring frost in Evanston, WY?
Plan for the last spring frost in Evanston around June 12 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Evanston, WY?
The first fall frost in Evanston typically arrives around September 12 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Evanston in?
Evanston 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 Evanston?
Evanston has about 92 frost-free days — a short growing season — between the average last spring frost (June 12) and first fall frost (September 12).
When should I plant tomatoes in Evanston?
For Evanston, sow tomatoes indoors about April 17–May 1 and move the seedlings out around June 19, after the last spring frost.
Never miss a window in Evanston
An email when it’s time to start seeds, transplant, and sow — timed to Evanston’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- North Ogden · 83 km
- South Ogden · 84 km
- Ogden · 84 km
- Hyrum · 84 km
- Farmington · 85 km
- Centerville · 86 km
- Layton · 86 km
- Kaysville · 86 km
Frost dates recorded at EVANSTON 1 E, 1 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 Evanston, WY — Frost Dates & Zone 5a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00483100. Retrieved from https://blissgarden.com/wyoming/evanston.