Granger, WY frost dates
Last spring frostMay 25median date
First fall frostSep 27median date
Growing season125 daysfrost-free
Hardiness zone4bZone 4b
How Granger compares
- In 8 years out of 10, the last spring frost in Granger falls between May 8 and June 11, a 34-day window. The first fall frost falls between September 14 and October 11.
- The median last frost is 4 days later than the Wyoming median of May 21.
- Its 125-day growing season is longer than 47% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 17 days later than the zone 4b median of May 8. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4b chart.
- The weather station records an average of 196 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 25 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 14 |
| 50% (median) | September 27 |
| 90% (late) | October 11 |
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 Granger, WY
Granger, WY frost dates — last frost May 25, first frost Sep 27, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 27 to May 11
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Sow outdoors: Apr 27 to Jun 1Plant for fall: Aug 2 to Aug 30
Start indoors: Mar 30 to Apr 13Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 19 to Aug 9
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 21 to Jul 12
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 5 to Jul 26
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 2 to Aug 23
Sow outdoors: Apr 20 to Jun 1Plant for fall: Aug 16 to Sep 6
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 15Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 12 to Jul 26
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 4 to May 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 11 to Jun 1Plant for fall: Aug 2 to Aug 23
Sow outdoors: Jun 1 to Jun 22Plant for fall: Jul 12 to Jul 26
Sow outdoors: Jun 1 to Jun 15
Transplant outside: Jun 8 to Jun 29
Plant for fall: Sep 13 to Oct 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Granger, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 2 – Mar 16 | Apr 27 – May 11 | — | — |
| Peppers | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Eggplant | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Tomatoes | Mar 30 – Apr 13 | Jun 1 – Jun 15 | — | — |
| Lettuce | Mar 30 – Apr 13 | May 4 – May 18 | Apr 27 – Jun 1 | Aug 2 – Aug 30 |
| Kale | Mar 30 – Apr 13 | Apr 27 – May 11 | Apr 27 – May 11 | Jul 19 – Aug 9 |
| Broccoli | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 21 – Jul 12 |
| Cabbage | Mar 30 – Apr 13 | May 4 – May 18 | — | Jun 21 – Jul 12 |
| Cauliflower | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 21 – Jul 12 |
| Okra | Apr 13 – Apr 27 | Jun 15 – Jun 29 | Jun 15 – Jun 29 | — |
| Basil | Apr 13 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Peas | — | — | Apr 13 – May 4 | Jul 5 – Jul 26 |
| Spinach | — | — | Apr 13 – May 4 | Aug 2 – Aug 23 |
| Radishes | — | — | Apr 20 – Jun 1 | Aug 16 – Sep 6 |
| Cucumbers | Apr 27 – May 4 | Jun 8 – Jun 15 | Jun 1 – Jun 15 | Jul 12 – Jul 26 |
| Zucchini & Summer Squash | Apr 27 – May 4 | — | Jun 1 – Jun 15 | Jul 19 – Aug 2 |
| Winter Squash & Pumpkins | Apr 27 – May 4 | — | Jun 1 – Jun 15 | — |
| Melons & Watermelon | Apr 27 – May 4 | Jun 8 – Jun 22 | — | — |
| Carrots | — | — | May 4 – Jun 1 | Jul 5 – Jul 19 |
| Beets | — | — | May 4 – Jun 1 | Jul 19 – Aug 2 |
| Potatoes | — | — | May 4 – May 25 | — |
| Swiss Chard | — | — | May 11 – Jun 8 | Jul 19 – Aug 2 |
| Cilantro | — | — | May 11 – Jun 1 | Aug 2 – Aug 23 |
| Green Beans | — | — | Jun 1 – Jun 22 | Jul 12 – Jul 26 |
| Sweet Corn | — | — | Jun 1 – Jun 15 | — |
| Sweet Potatoes | — | Jun 8 – Jun 29 | — | — |
| Garlic | — | — | — | Sep 13 – Oct 18 |
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 Church Buttes Gas Plt, WY weather station, 24 km away (elevation 7,080 ft (2,158 m)).
Frost dates near Granger
- Little America May 25 · Sep 27
- Opal frost any month
- Lyman Jun 14 · Sep 9
- Green River May 24 · Sep 22
- Fort Bridger Jun 14 · Sep 9
- Mountain View Jun 14 · Sep 9
- Kemmerer frost any month
- Diamondville frost any month
- Frontier frost any month
- Mc Kinnon May 22 · Sep 29
Frequently asked questions
When is the last frost in Granger, WY?
The median last spring frost in Granger, WY is May 25. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Granger, WY?
The median first fall frost is September 27, with about a 10% chance of frost before September 14.
How long is the growing season in Granger, WY?
About 125 days between the median last spring frost and first fall frost.
What planting zone is Granger, WY?
Granger, WY is in USDA hardiness zone 4b.