Frost dates for 82717 — Gillette, WY
Last spring frostMay 22median date
First fall frostSep 25median date
Growing season126 daysfrost-free
Hardiness zone5aZone 5a
How Gillette compares
- In 8 years out of 10, the last spring frost in Gillette falls between May 8 and June 4, a 27-day window. The first fall frost falls between September 9 and October 8.
- The median last frost is 1 day later than the Wyoming median of May 21.
- Its 126-day growing season is longer than 50% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 19 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 179 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 22 |
| 10% (safe for tender plants) | June 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 9 |
| 50% (median) | September 25 |
| 90% (late) | October 8 |
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 Gillette, WY
Frost dates for 82717 — Gillette, WY — last frost May 22, first frost Sep 25, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 27 to Mar 13Transplant outside: Apr 24 to May 8
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 13 to Mar 27Transplant outside: Jun 5 to Jun 19
Start indoors: Mar 27 to Apr 10Transplant outside: May 29 to Jun 12
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Sow outdoors: Apr 24 to May 29Plant for fall: Jul 31 to Aug 28
Start indoors: Mar 27 to Apr 10Transplant outside: Apr 24 to May 8Sow outdoors: Apr 24 to May 8Plant for fall: Jul 17 to Aug 7
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 19 to Jul 10
Start indoors: Mar 27 to Apr 10Transplant outside: May 1 to May 15Plant for fall: Jun 19 to Jul 10
Start indoors: Mar 27 to Apr 10Transplant outside: May 8 to May 22Plant for fall: Jun 19 to Jul 10
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 29 to Jun 12
Sow outdoors: Apr 10 to May 1Plant for fall: Jul 3 to Jul 24
Sow outdoors: Apr 10 to May 1Plant for fall: Jul 31 to Aug 21
Sow outdoors: Apr 17 to May 29Plant for fall: Aug 14 to Sep 4
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 12Sow outdoors: May 29 to Jun 12Plant for fall: Jul 10 to Jul 24
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12Plant for fall: Jul 17 to Jul 31
Start indoors: Apr 24 to May 1Sow outdoors: May 29 to Jun 12
Start indoors: Apr 24 to May 1Transplant outside: Jun 5 to Jun 19
Sow outdoors: May 1 to May 29Plant for fall: Jul 3 to Jul 17
Sow outdoors: May 1 to May 29Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 1 to May 22
Sow outdoors: May 8 to Jun 5Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 8 to May 29Plant for fall: Jul 31 to Aug 21
Sow outdoors: May 29 to Jun 19Plant for fall: Jul 10 to Jul 24
Sow outdoors: May 29 to Jun 12
Transplant outside: Jun 5 to Jun 26
Plant for fall: Sep 11 to Oct 16
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Gillette, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 27 – Mar 13 | Apr 24 – May 8 | — | — |
| Peppers | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Eggplant | Mar 13 – Mar 27 | Jun 5 – Jun 19 | — | — |
| Tomatoes | Mar 27 – Apr 10 | May 29 – Jun 12 | — | — |
| Lettuce | Mar 27 – Apr 10 | May 1 – May 15 | Apr 24 – May 29 | Jul 31 – Aug 28 |
| Kale | Mar 27 – Apr 10 | Apr 24 – May 8 | Apr 24 – May 8 | Jul 17 – Aug 7 |
| Broccoli | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 19 – Jul 10 |
| Cabbage | Mar 27 – Apr 10 | May 1 – May 15 | — | Jun 19 – Jul 10 |
| Cauliflower | Mar 27 – Apr 10 | May 8 – May 22 | — | Jun 19 – Jul 10 |
| Okra | Apr 10 – Apr 24 | Jun 12 – Jun 26 | Jun 12 – Jun 26 | — |
| Basil | Apr 10 – Apr 24 | May 29 – Jun 12 | — | — |
| Peas | — | — | Apr 10 – May 1 | Jul 3 – Jul 24 |
| Spinach | — | — | Apr 10 – May 1 | Jul 31 – Aug 21 |
| Radishes | — | — | Apr 17 – May 29 | Aug 14 – Sep 4 |
| Cucumbers | Apr 24 – May 1 | Jun 5 – Jun 12 | May 29 – Jun 12 | Jul 10 – Jul 24 |
| Zucchini & Summer Squash | Apr 24 – May 1 | — | May 29 – Jun 12 | Jul 17 – Jul 31 |
| Winter Squash & Pumpkins | Apr 24 – May 1 | — | May 29 – Jun 12 | — |
| Melons & Watermelon | Apr 24 – May 1 | Jun 5 – Jun 19 | — | — |
| Carrots | — | — | May 1 – May 29 | Jul 3 – Jul 17 |
| Beets | — | — | May 1 – May 29 | Jul 17 – Jul 31 |
| Potatoes | — | — | May 1 – May 22 | — |
| Swiss Chard | — | — | May 8 – Jun 5 | Jul 17 – Jul 31 |
| Cilantro | — | — | May 8 – May 29 | Jul 31 – Aug 21 |
| Green Beans | — | — | May 29 – Jun 19 | Jul 10 – Jul 24 |
| Sweet Corn | — | — | May 29 – Jun 12 | — |
| Sweet Potatoes | — | Jun 5 – Jun 26 | — | — |
| Garlic | — | — | — | Sep 11 – Oct 16 |
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 Gillette Campbell Ap, WY weather station, 5 km away (elevation 4,354 ft (1,327 m)).
ZIP codes in Gillette: 82716 82717
Frost dates near Gillette
- Rozet May 15 · Oct 1
- Gillette (Campbell) May 25 · Sep 23
- Weston May 23 · Sep 18
- Moorcroft May 23 · Sep 20
- Recluse May 21 · Sep 23
- Wright May 25 · Sep 23
- Arvada May 14 · Sep 30
- Devils Tower May 23 · Sep 20
Frequently asked questions
When is the last frost in Gillette, WY?
The median last spring frost in Gillette, WY is May 22. There is still about a 10% chance of frost after June 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Gillette, WY?
The median first fall frost is September 25, with about a 10% chance of frost before September 9.
How long is the growing season in Gillette, WY?
About 126 days between the median last spring frost and first fall frost.
What planting zone is Gillette, WY?
Gillette, WY is in USDA hardiness zone 5a.