Wyola, MT frost dates
Last spring frostMay 21median date
First fall frostSep 17median date
Growing season119 daysfrost-free
Hardiness zone4bZone 4b
How Wyola compares
- In 8 years out of 10, the last spring frost in Wyola falls between May 9 and June 2, a 24-day window. The first fall frost falls between September 5 and October 1.
- The median last frost is 2 days later than the Montana median of May 19.
- Its 119-day growing season is longer than 33% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is 13 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 197 nights a year at or below 32°F.
- Compared with Billings, MT, 114 km away, the last frost here is 17 days later than there and the growing season is 37 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 5 |
| 50% (median) | September 17 |
| 90% (late) | October 1 |
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 Wyola, MT
Wyola, MT frost dates — last frost May 21, first frost Sep 17, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Jul 23 to Aug 20
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 11 to Jul 2
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 11 to Jul 2
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 11 to Jul 2
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jun 25 to Jul 16
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 23 to Aug 13
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 6 to Aug 27
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 2 to Jul 16
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 9 to Jul 23
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jun 25 to Jul 9
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 7 to May 28Plant for fall: Jul 23 to Aug 13
Sow outdoors: May 28 to Jun 18
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 3 to Oct 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wyola, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Jul 23 – Aug 20 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 9 – Jul 30 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 11 – Jul 2 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 11 – Jul 2 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 11 – Jul 2 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jun 25 – Jul 16 |
| Spinach | — | — | Apr 9 – Apr 30 | Jul 23 – Aug 13 |
| Radishes | — | — | Apr 16 – May 28 | Aug 6 – Aug 27 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 2 – Jul 16 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 9 – Jul 23 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jun 25 – Jul 9 |
| Beets | — | — | Apr 30 – May 28 | Jul 9 – Jul 23 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 9 – Jul 23 |
| Cilantro | — | — | May 7 – May 28 | Jul 23 – Aug 13 |
| Green Beans | — | — | May 28 – Jun 18 | — |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 3 – Oct 8 |
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 Wyola 1 Sw, MT weather station, 2 km away (elevation 3,730 ft (1,137 m)).
Frost dates near Wyola
- Lodge Grass May 21 · Sep 17
- Decker May 18 · Sep 24
- Fort Smith May 7 · Oct 5
- Garryowen May 13 · Sep 29
- Saint Xavier May 7 · Oct 5
- Crow Agency May 13 · Sep 29
- Busby May 23 · Sep 15
- Hardin May 13 · Sep 29
- Birney May 23 · Sep 15
- Lame Deer May 23 · Sep 15
Frequently asked questions
When is the last frost in Wyola, MT?
The median last spring frost in Wyola, MT is May 21. There is still about a 10% chance of frost after June 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wyola, MT?
The median first fall frost is September 17, with about a 10% chance of frost before September 5.
How long is the growing season in Wyola, MT?
About 119 days between the median last spring frost and first fall frost.
What planting zone is Wyola, MT?
Wyola, MT is in USDA hardiness zone 4b.