Moose, WY frost dates
Last spring frostJun 24median date
First fall frostAug 28median date
Growing season65 daysfrost-free
Hardiness zone4aZone 4a
How Moose compares
- In 8 years out of 10, the last spring frost in Moose falls between June 8 and July 11, a 33-day window. The first fall frost falls between August 8 and September 12.
- The median last frost is 34 days later than the Wyoming median of May 21.
- Its 65-day growing season is among the shortest of the 153 Wyoming places with a regular frost season.
- The last frost is 43 days later than the zone 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- The weather station records an average of 235 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 105 km away, the last frost here is 46 days later than there and the growing season is 80 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | June 8 |
| 50% (median) | June 24 |
| 10% (safe for tender plants) | July 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 8 |
| 50% (median) | August 28 |
| 90% (late) | September 12 |
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 Moose, WY
Moose, WY frost dates — last frost Jun 24, first frost Aug 28, zone 4a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Apr 1 to Apr 15Transplant outside: May 27 to Jun 10
Start indoors: Apr 15 to Apr 29Transplant outside: Jul 8 to Jul 22
Start indoors: Apr 15 to Apr 29Transplant outside: Jul 8 to Jul 22
Start indoors: Apr 29 to May 13Transplant outside: Jul 1 to Jul 15
Start indoors: Apr 29 to May 13Transplant outside: Jun 3 to Jun 17Sow outdoors: May 27 to Jul 1
Start indoors: Apr 29 to May 13Transplant outside: May 27 to Jun 10Sow outdoors: May 27 to Jun 10
Start indoors: Apr 29 to May 13Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 29 to May 13Transplant outside: Jun 3 to Jun 17
Start indoors: Apr 29 to May 13Transplant outside: Jun 10 to Jun 24
Start indoors: May 13 to May 27Transplant outside: Jul 15 to Jul 29Sow outdoors: Jul 15 to Jul 29
Start indoors: May 13 to May 27Transplant outside: Jul 1 to Jul 15
Sow outdoors: May 13 to Jun 3
Sow outdoors: May 13 to Jun 3
Sow outdoors: May 20 to Jul 1Plant for fall: Jul 17 to Aug 7
Start indoors: May 27 to Jun 3Transplant outside: Jul 8 to Jul 15Sow outdoors: Jul 1 to Jul 15
Start indoors: May 27 to Jun 3Sow outdoors: Jul 1 to Jul 15
Start indoors: May 27 to Jun 3Sow outdoors: Jul 1 to Jul 15
Start indoors: May 27 to Jun 3Transplant outside: Jul 8 to Jul 22
Sow outdoors: Jun 3 to Jul 1
Sow outdoors: Jun 3 to Jul 1
Sow outdoors: Jun 3 to Jun 24
Sow outdoors: Jun 10 to Jul 8
Sow outdoors: Jun 10 to Jul 1
Sow outdoors: Jul 1 to Jul 22
Sow outdoors: Jul 1 to Jul 15
Transplant outside: Jul 8 to Jul 29
Plant for fall: Aug 14 to Sep 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Moose, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Apr 1 – Apr 15 | May 27 – Jun 10 | — | — |
| Peppers Warning: Your frost-free season is about 65 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Apr 15 – Apr 29 | Jul 8 – Jul 22 | — | — |
| Eggplant Warning: Your frost-free season is about 65 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Apr 15 – Apr 29 | Jul 8 – Jul 22 | — | — |
| Tomatoes Warning: Your frost-free season is about 65 days, which is tight for tomatoes (70+ days). Choose early varieties and use transplants or row covers. | Apr 29 – May 13 | Jul 1 – Jul 15 | — | — |
| Lettuce | Apr 29 – May 13 | Jun 3 – Jun 17 | May 27 – Jul 1 | — |
| Kale | Apr 29 – May 13 | May 27 – Jun 10 | May 27 – Jun 10 | — |
| Broccoli | Apr 29 – May 13 | Jun 10 – Jun 24 | — | — |
| Cabbage | Apr 29 – May 13 | Jun 3 – Jun 17 | — | — |
| Cauliflower | Apr 29 – May 13 | Jun 10 – Jun 24 | — | — |
| Okra Warning: Your frost-free season is about 65 days, which is tight for okra (60+ days). Choose early varieties and use transplants or row covers. | May 13 – May 27 | Jul 15 – Jul 29 | Jul 15 – Jul 29 | — |
| Basil Warning: Your frost-free season is about 65 days, which is tight for basil (60+ days). Choose early varieties and use transplants or row covers. | May 13 – May 27 | Jul 1 – Jul 15 | — | — |
| Peas | — | — | May 13 – Jun 3 | — |
| Spinach | — | — | May 13 – Jun 3 | — |
| Radishes | — | — | May 20 – Jul 1 | Jul 17 – Aug 7 |
| Cucumbers Warning: Your frost-free season is about 65 days, which is tight for cucumbers (55+ days). Choose early varieties and use transplants or row covers. | May 27 – Jun 3 | Jul 8 – Jul 15 | Jul 1 – Jul 15 | — |
| Zucchini & Summer Squash | May 27 – Jun 3 | — | Jul 1 – Jul 15 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 65 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 27 – Jun 3 | — | Jul 1 – Jul 15 | — |
| Melons & Watermelon Warning: Your frost-free season is about 65 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 27 – Jun 3 | Jul 8 – Jul 22 | — | — |
| Carrots | — | — | Jun 3 – Jul 1 | — |
| Beets | — | — | Jun 3 – Jul 1 | — |
| Potatoes | — | — | Jun 3 – Jun 24 | — |
| Swiss Chard | — | — | Jun 10 – Jul 8 | — |
| Cilantro | — | — | Jun 10 – Jul 1 | — |
| Green Beans Warning: Your frost-free season is about 65 days, which is tight for green beans (55+ days). Choose early varieties and use transplants or row covers. | — | — | Jul 1 – Jul 22 | — |
| Sweet Corn Warning: Your frost-free season is about 65 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jul 1 – Jul 15 | — |
| Sweet Potatoes Warning: Your frost-free season is about 65 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jul 8 – Jul 29 | — | — |
| Garlic | — | — | — | Aug 14 – Sep 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 Moose 1 Nne, WY weather station, 6 km away (elevation 6,467 ft (1,971 m)).
Frost dates near Moose
- Teton Village Jun 20 · Aug 31
- Kelly Jun 24 · Aug 28
- Alta Jun 14 · Sep 11
- Wilson frost any month
- Jackson frost any month
- Moran frost any month
- Bondurant frost any month
- Alpine frost any month
- Etna frost any month
- Freedom frost any month
Frequently asked questions
When is the last frost in Moose, WY?
The median last spring frost in Moose, WY is June 24. There is still about a 10% chance of frost after July 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Moose, WY?
The median first fall frost is August 28, with about a 10% chance of frost before August 8.
How long is the growing season in Moose, WY?
About 65 days between the median last spring frost and first fall frost.
What planting zone is Moose, WY?
Moose, WY is in USDA hardiness zone 4a.