Frost dates for 82931 — Evanston, WY
Last spring frostJun 12median date
First fall frostSep 12median date
Growing season92 daysfrost-free
Hardiness zone5aZone 5a
How Evanston compares
- In 8 years out of 10, the last spring frost in Evanston falls between May 26 and July 2, a 37-day window. The first fall frost falls between August 26 and September 25.
- The median last frost is 22 days later than the Wyoming median of May 21.
- Its 92-day growing season is longer than 12% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 40 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 210 nights a year at or below 32°F.
- Compared with Ogden, UT, 87 km away, the last frost here is 52 days later than there and the growing season is 93 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 26 |
| 50% (median) | June 12 |
| 10% (safe for tender plants) | July 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 26 |
| 50% (median) | September 12 |
| 90% (late) | September 25 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Evanston, WY
Frost dates for 82931 — Evanston, WY — last frost Jun 12, first frost Sep 12, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 20 to Apr 3Transplant outside: May 15 to May 29
Start indoors: Apr 3 to Apr 17Transplant outside: Jun 26 to Jul 10
Start indoors: Apr 3 to Apr 17Transplant outside: Jun 26 to Jul 10
Start indoors: Apr 17 to May 1Transplant outside: Jun 19 to Jul 3
Start indoors: Apr 17 to May 1Transplant outside: May 22 to Jun 5Sow outdoors: May 15 to Jun 19Plant for fall: Jul 18 to Aug 15
Start indoors: Apr 17 to May 1Transplant outside: May 15 to May 29Sow outdoors: May 15 to May 29Plant for fall: Jul 4 to Jul 25
Start indoors: Apr 17 to May 1Transplant outside: May 29 to Jun 12
Start indoors: Apr 17 to May 1Transplant outside: May 22 to Jun 5
Start indoors: Apr 17 to May 1Transplant outside: May 29 to Jun 12
Start indoors: May 1 to May 15Transplant outside: Jul 3 to Jul 17Sow outdoors: Jul 3 to Jul 17
Start indoors: May 1 to May 15Transplant outside: Jun 19 to Jul 3
Sow outdoors: May 1 to May 22
Sow outdoors: May 1 to May 22Plant for fall: Jul 18 to Aug 8
Sow outdoors: May 8 to Jun 19Plant for fall: Aug 1 to Aug 22
Start indoors: May 15 to May 22Transplant outside: Jun 26 to Jul 3Sow outdoors: Jun 19 to Jul 3
Start indoors: May 15 to May 22Sow outdoors: Jun 19 to Jul 3
Start indoors: May 15 to May 22Sow outdoors: Jun 19 to Jul 3
Start indoors: May 15 to May 22Transplant outside: Jun 26 to Jul 10
Sow outdoors: May 22 to Jun 19
Sow outdoors: May 22 to Jun 19Plant for fall: Jul 4 to Jul 18
Sow outdoors: May 22 to Jun 12
Sow outdoors: May 29 to Jun 26
Sow outdoors: May 29 to Jun 19Plant for fall: Jul 18 to Aug 8
Sow outdoors: Jun 19 to Jul 10
Sow outdoors: Jun 19 to Jul 3
Transplant outside: Jun 26 to Jul 17
Plant for fall: Aug 29 to Oct 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Evanston, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 20 – Apr 3 | May 15 – May 29 | — | — |
| Peppers | Apr 3 – Apr 17 | Jun 26 – Jul 10 | — | — |
| Eggplant | Apr 3 – Apr 17 | Jun 26 – Jul 10 | — | — |
| Tomatoes | Apr 17 – May 1 | Jun 19 – Jul 3 | — | — |
| Lettuce | Apr 17 – May 1 | May 22 – Jun 5 | May 15 – Jun 19 | Jul 18 – Aug 15 |
| Kale | Apr 17 – May 1 | May 15 – May 29 | May 15 – May 29 | Jul 4 – Jul 25 |
| Broccoli | Apr 17 – May 1 | May 29 – Jun 12 | — | — |
| Cabbage | Apr 17 – May 1 | May 22 – Jun 5 | — | — |
| Cauliflower | Apr 17 – May 1 | May 29 – Jun 12 | — | — |
| Okra | May 1 – May 15 | Jul 3 – Jul 17 | Jul 3 – Jul 17 | — |
| Basil | May 1 – May 15 | Jun 19 – Jul 3 | — | — |
| Peas | — | — | May 1 – May 22 | — |
| Spinach | — | — | May 1 – May 22 | Jul 18 – Aug 8 |
| Radishes | — | — | May 8 – Jun 19 | Aug 1 – Aug 22 |
| Cucumbers | May 15 – May 22 | Jun 26 – Jul 3 | Jun 19 – Jul 3 | — |
| Zucchini & Summer Squash | May 15 – May 22 | — | Jun 19 – Jul 3 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 92 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 15 – May 22 | — | Jun 19 – Jul 3 | — |
| Melons & Watermelon Warning: Your frost-free season is about 92 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 15 – May 22 | Jun 26 – Jul 10 | — | — |
| Carrots | — | — | May 22 – Jun 19 | — |
| Beets | — | — | May 22 – Jun 19 | Jul 4 – Jul 18 |
| Potatoes | — | — | May 22 – Jun 12 | — |
| Swiss Chard | — | — | May 29 – Jun 26 | — |
| Cilantro | — | — | May 29 – Jun 19 | Jul 18 – Aug 8 |
| Green Beans | — | — | Jun 19 – Jul 10 | — |
| Sweet Corn Warning: Your frost-free season is about 92 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 19 – Jul 3 | — |
| Sweet Potatoes Warning: Your frost-free season is about 92 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 26 – Jul 17 | — | — |
| Garlic | — | — | — | Aug 29 – Oct 3 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Evanston 1 E, WY weather station, 3 km away (elevation 6,824 ft (2,080 m)).
ZIP codes in Evanston: 82930 82931
Frost dates near Evanston
- Robertson Jun 14 · Sep 9
- Fort Bridger Jun 14 · Sep 9
- Mountain View Jun 14 · Sep 9
- Lyman Jun 14 · Sep 9
- Diamondville frost any month
- Kemmerer frost any month
- Lonetree Jun 14 · Sep 9
- Frontier frost any month
Frequently asked questions
When is the last frost in Evanston, WY?
The median last spring frost in Evanston, WY is June 12. There is still about a 10% chance of frost after July 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Evanston, WY?
The median first fall frost is September 12, with about a 10% chance of frost before August 26.
How long is the growing season in Evanston, WY?
About 92 days between the median last spring frost and first fall frost.
What planting zone is Evanston, WY?
Evanston, WY is in USDA hardiness zone 5a.