Canyon Creek, MT frost dates
Last spring frostJun 4median date
First fall frostSep 14median date
Growing season102 daysfrost-free
Hardiness zone4bZone 4b
How Canyon Creek compares
- In 8 years out of 10, the last spring frost in Canyon Creek falls between May 18 and June 18, a 31-day window. The first fall frost falls between August 30 and September 27.
- The median last frost is 16 days later than the Montana median of May 19.
- Its 102-day growing season is longer than 13% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is 27 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 204 nights a year at or below 32°F.
- Compared with Great Falls, MT, 114 km away, the last frost here is 29 days later than there and the growing season is 46 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 18 |
| 50% (median) | June 4 |
| 10% (safe for tender plants) | June 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 30 |
| 50% (median) | September 14 |
| 90% (late) | September 27 |
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 Canyon Creek, MT
Canyon Creek, MT frost dates — last frost Jun 4, first frost Sep 14, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 12 to Mar 26Transplant outside: May 7 to May 21
Start indoors: Mar 26 to Apr 9Transplant outside: Jun 18 to Jul 2
Start indoors: Mar 26 to Apr 9Transplant outside: Jun 18 to Jul 2
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 14 to May 28Sow outdoors: May 7 to Jun 11Plant for fall: Jul 20 to Aug 17
Start indoors: Apr 9 to Apr 23Transplant outside: May 7 to May 21Sow outdoors: May 7 to May 21Plant for fall: Jul 6 to Jul 27
Start indoors: Apr 9 to Apr 23Transplant outside: May 21 to Jun 4
Start indoors: Apr 9 to Apr 23Transplant outside: May 14 to May 28
Start indoors: Apr 9 to Apr 23Transplant outside: May 21 to Jun 4
Start indoors: Apr 23 to May 7Transplant outside: Jun 25 to Jul 9Sow outdoors: Jun 25 to Jul 9
Start indoors: Apr 23 to May 7Transplant outside: Jun 11 to Jun 25
Sow outdoors: Apr 23 to May 14Plant for fall: Jun 22 to Jul 13
Sow outdoors: Apr 23 to May 14Plant for fall: Jul 20 to Aug 10
Sow outdoors: Apr 30 to Jun 11Plant for fall: Aug 3 to Aug 24
Start indoors: May 7 to May 14Transplant outside: Jun 18 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: May 7 to May 14Sow outdoors: Jun 11 to Jun 25
Start indoors: May 7 to May 14Sow outdoors: Jun 11 to Jun 25
Start indoors: May 7 to May 14Transplant outside: Jun 18 to Jul 2
Sow outdoors: May 14 to Jun 11
Sow outdoors: May 14 to Jun 11Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 14 to Jun 4
Sow outdoors: May 21 to Jun 18Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 21 to Jun 11Plant for fall: Jul 20 to Aug 10
Sow outdoors: Jun 11 to Jul 2
Sow outdoors: Jun 11 to Jun 25
Transplant outside: Jun 18 to Jul 9
Plant for fall: Aug 31 to Oct 5
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Canyon Creek, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 12 – Mar 26 | May 7 – May 21 | — | — |
| Peppers | Mar 26 – Apr 9 | Jun 18 – Jul 2 | — | — |
| Eggplant | Mar 26 – Apr 9 | Jun 18 – Jul 2 | — | — |
| Tomatoes | Apr 9 – Apr 23 | Jun 11 – Jun 25 | — | — |
| Lettuce | Apr 9 – Apr 23 | May 14 – May 28 | May 7 – Jun 11 | Jul 20 – Aug 17 |
| Kale | Apr 9 – Apr 23 | May 7 – May 21 | May 7 – May 21 | Jul 6 – Jul 27 |
| Broccoli | Apr 9 – Apr 23 | May 21 – Jun 4 | — | — |
| Cabbage | Apr 9 – Apr 23 | May 14 – May 28 | — | — |
| Cauliflower | Apr 9 – Apr 23 | May 21 – Jun 4 | — | — |
| Okra | Apr 23 – May 7 | Jun 25 – Jul 9 | Jun 25 – Jul 9 | — |
| Basil | Apr 23 – May 7 | Jun 11 – Jun 25 | — | — |
| Peas | — | — | Apr 23 – May 14 | Jun 22 – Jul 13 |
| Spinach | — | — | Apr 23 – May 14 | Jul 20 – Aug 10 |
| Radishes | — | — | Apr 30 – Jun 11 | Aug 3 – Aug 24 |
| Cucumbers | May 7 – May 14 | Jun 18 – Jun 25 | Jun 11 – Jun 25 | — |
| Zucchini & Summer Squash | May 7 – May 14 | — | Jun 11 – Jun 25 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 102 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 7 – May 14 | — | Jun 11 – Jun 25 | — |
| Melons & Watermelon | May 7 – May 14 | Jun 18 – Jul 2 | — | — |
| Carrots | — | — | May 14 – Jun 11 | — |
| Beets | — | — | May 14 – Jun 11 | Jul 6 – Jul 20 |
| Potatoes | — | — | May 14 – Jun 4 | — |
| Swiss Chard | — | — | May 21 – Jun 18 | Jul 6 – Jul 20 |
| Cilantro | — | — | May 21 – Jun 11 | Jul 20 – Aug 10 |
| Green Beans | — | — | Jun 11 – Jul 2 | — |
| Sweet Corn | — | — | Jun 11 – Jun 25 | — |
| Sweet Potatoes Warning: Your frost-free season is about 102 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 18 – Jul 9 | — | — |
| Garlic | — | — | — | Aug 31 – Oct 5 |
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 Austin 1 W, MT weather station, 13 km away (elevation 4,852 ft (1,479 m)).
Frost dates near Canyon Creek
- Marysville Jun 4 · Sep 14
- Fort Harrison May 9 · Sep 30
- Helena May 9 · Sep 30
- Elliston Jun 9 · Sep 8
- Avon Jun 9 · Sep 8
- East Helena May 9 · Sep 30
- Lincoln frost any month
- Wolf Creek May 19 · Sep 24
- Clancy Jun 18 · Sep 5
- Garrison frost any month
Frequently asked questions
When is the last frost in Canyon Creek, MT?
The median last spring frost in Canyon Creek, MT is June 4. There is still about a 10% chance of frost after June 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Canyon Creek, MT?
The median first fall frost is September 14, with about a 10% chance of frost before August 30.
How long is the growing season in Canyon Creek, MT?
About 102 days between the median last spring frost and first fall frost.
What planting zone is Canyon Creek, MT?
Canyon Creek, MT is in USDA hardiness zone 4b.