Garrett, WY frost dates
Last spring frostJun 2median date
First fall frostSep 9median date
Growing season99 daysfrost-free
Hardiness zone5aZone 5a
How Garrett compares
- In 8 years out of 10, the last spring frost in Garrett falls between May 18 and June 25, a 38-day window. The first fall frost falls between August 26 and September 22.
- The median last frost is 12 days later than the Wyoming median of May 21.
- Its 99-day growing season is longer than 13% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 30 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 203 nights a year at or below 32°F.
- Compared with Casper, WY, 90 km away, the last frost here is 23 days later than there and the growing season is 43 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 18 |
| 50% (median) | June 2 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 26 |
| 50% (median) | September 9 |
| 90% (late) | September 22 |
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 Garrett, WY
Garrett, WY frost dates — last frost Jun 2, first frost Sep 9, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Mar 10 to Mar 24Transplant outside: May 5 to May 19
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Mar 24 to Apr 7Transplant outside: Jun 16 to Jun 30
Start indoors: Apr 7 to Apr 21Transplant outside: Jun 9 to Jun 23
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26Sow outdoors: May 5 to Jun 9Plant for fall: Jul 15 to Aug 12
Start indoors: Apr 7 to Apr 21Transplant outside: May 5 to May 19Sow outdoors: May 5 to May 19Plant for fall: Jul 1 to Jul 22
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 7 to Apr 21Transplant outside: May 12 to May 26
Start indoors: Apr 7 to Apr 21Transplant outside: May 19 to Jun 2
Start indoors: Apr 21 to May 5Transplant outside: Jun 23 to Jul 7Sow outdoors: Jun 23 to Jul 7
Start indoors: Apr 21 to May 5Transplant outside: Jun 9 to Jun 23
Sow outdoors: Apr 21 to May 12Plant for fall: Jun 17 to Jul 8
Sow outdoors: Apr 21 to May 12Plant for fall: Jul 15 to Aug 5
Sow outdoors: Apr 28 to Jun 9Plant for fall: Jul 29 to Aug 19
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 23Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Sow outdoors: Jun 9 to Jun 23
Start indoors: May 5 to May 12Transplant outside: Jun 16 to Jun 30
Sow outdoors: May 12 to Jun 9
Sow outdoors: May 12 to Jun 9Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 12 to Jun 2
Sow outdoors: May 19 to Jun 16Plant for fall: Jul 1 to Jul 15
Sow outdoors: May 19 to Jun 9Plant for fall: Jul 15 to Aug 5
Sow outdoors: Jun 9 to Jun 30
Sow outdoors: Jun 9 to Jun 23
Transplant outside: Jun 16 to Jul 7
Plant for fall: Aug 26 to Sep 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Garrett, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 10 – Mar 24 | May 5 – May 19 | — | — |
| Peppers | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Eggplant | Mar 24 – Apr 7 | Jun 16 – Jun 30 | — | — |
| Tomatoes | Apr 7 – Apr 21 | Jun 9 – Jun 23 | — | — |
| Lettuce | Apr 7 – Apr 21 | May 12 – May 26 | May 5 – Jun 9 | Jul 15 – Aug 12 |
| Kale | Apr 7 – Apr 21 | May 5 – May 19 | May 5 – May 19 | Jul 1 – Jul 22 |
| Broccoli | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Cabbage | Apr 7 – Apr 21 | May 12 – May 26 | — | — |
| Cauliflower | Apr 7 – Apr 21 | May 19 – Jun 2 | — | — |
| Okra | Apr 21 – May 5 | Jun 23 – Jul 7 | Jun 23 – Jul 7 | — |
| Basil | Apr 21 – May 5 | Jun 9 – Jun 23 | — | — |
| Peas | — | — | Apr 21 – May 12 | Jun 17 – Jul 8 |
| Spinach | — | — | Apr 21 – May 12 | Jul 15 – Aug 5 |
| Radishes | — | — | Apr 28 – Jun 9 | Jul 29 – Aug 19 |
| Cucumbers | May 5 – May 12 | Jun 16 – Jun 23 | Jun 9 – Jun 23 | — |
| Zucchini & Summer Squash | May 5 – May 12 | — | Jun 9 – Jun 23 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 99 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 5 – May 12 | — | Jun 9 – Jun 23 | — |
| Melons & Watermelon | May 5 – May 12 | Jun 16 – Jun 30 | — | — |
| Carrots | — | — | May 12 – Jun 9 | — |
| Beets | — | — | May 12 – Jun 9 | Jul 1 – Jul 15 |
| Potatoes | — | — | May 12 – Jun 2 | — |
| Swiss Chard | — | — | May 19 – Jun 16 | Jul 1 – Jul 15 |
| Cilantro | — | — | May 19 – Jun 9 | Jul 15 – Aug 5 |
| Green Beans | — | — | Jun 9 – Jun 30 | — |
| Sweet Corn | — | — | Jun 9 – Jun 23 | — |
| Sweet Potatoes Warning: Your frost-free season is about 99 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 16 – Jul 7 | — | — |
| Garlic | — | — | — | Aug 26 – Sep 30 |
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 Double Four Rch, WY weather station, 23 km away (elevation 6,119 ft (1,865 m)).
Frost dates near Garrett
- Medicine Bow Jun 1 · Sep 8
- Rock River Jun 1 · Sep 8
- Wheatland May 19 · Sep 22
- Glendo May 9 · Oct 5
- Glenrock May 12 · Oct 1
- Douglas May 19 · Sep 23
- Bosler Jun 7 · Sep 4
- Guernsey May 7 · Oct 6
- Hanna May 28 · Sep 13
- Hartville May 11 · Oct 3
Frequently asked questions
When is the last frost in Garrett, WY?
The median last spring frost in Garrett, WY is June 2. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Garrett, WY?
The median first fall frost is September 9, with about a 10% chance of frost before August 26.
How long is the growing season in Garrett, WY?
About 99 days between the median last spring frost and first fall frost.
What planting zone is Garrett, WY?
Garrett, WY is in USDA hardiness zone 5a.