Clancy, MT frost dates
Last spring frostJun 18median date
First fall frostSep 5median date
Growing season79 daysfrost-free
Hardiness zone4bZone 4b
How Clancy compares
- In 8 years out of 10, the last spring frost in Clancy falls between May 30 and July 3, a 34-day window. The first fall frost falls between August 21 and September 18.
- The median last frost is 30 days later than the Montana median of May 19.
- Its 79-day growing season is among the shortest of the 325 Montana places with a regular frost season.
- The last frost is 41 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 223 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 30 |
| 50% (median) | June 18 |
| 10% (safe for tender plants) | July 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 21 |
| 50% (median) | September 5 |
| 90% (late) | September 18 |
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 Clancy, MT
Clancy, MT frost dates — last frost Jun 18, first frost Sep 5, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 26 to Apr 9Transplant outside: May 21 to Jun 4
Start indoors: Apr 9 to Apr 23Transplant outside: Jul 2 to Jul 16
Start indoors: Apr 9 to Apr 23Transplant outside: Jul 2 to Jul 16
Start indoors: Apr 23 to May 7Transplant outside: Jun 25 to Jul 9
Start indoors: Apr 23 to May 7Transplant outside: May 28 to Jun 11Sow outdoors: May 21 to Jun 25Plant for fall: Jul 11 to Aug 8
Start indoors: Apr 23 to May 7Transplant outside: May 21 to Jun 4Sow outdoors: May 21 to Jun 4
Start indoors: Apr 23 to May 7Transplant outside: Jun 4 to Jun 18
Start indoors: Apr 23 to May 7Transplant outside: May 28 to Jun 11
Start indoors: Apr 23 to May 7Transplant outside: Jun 4 to Jun 18
Start indoors: May 7 to May 21Transplant outside: Jul 9 to Jul 23Sow outdoors: Jul 9 to Jul 23
Start indoors: May 7 to May 21Transplant outside: Jun 25 to Jul 9
Sow outdoors: May 7 to May 28
Sow outdoors: May 7 to May 28Plant for fall: Jul 11 to Aug 1
Sow outdoors: May 14 to Jun 25Plant for fall: Jul 25 to Aug 15
Start indoors: May 21 to May 28Transplant outside: Jul 2 to Jul 9Sow outdoors: Jun 25 to Jul 9
Start indoors: May 21 to May 28Sow outdoors: Jun 25 to Jul 9
Start indoors: May 21 to May 28Sow outdoors: Jun 25 to Jul 9
Start indoors: May 21 to May 28Transplant outside: Jul 2 to Jul 16
Sow outdoors: May 28 to Jun 25
Sow outdoors: May 28 to Jun 25
Sow outdoors: May 28 to Jun 18
Sow outdoors: Jun 4 to Jul 2
Sow outdoors: Jun 4 to Jun 25Plant for fall: Jul 11 to Aug 1
Sow outdoors: Jun 25 to Jul 16
Sow outdoors: Jun 25 to Jul 9
Transplant outside: Jul 2 to Jul 23
Plant for fall: Aug 22 to Sep 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Clancy, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 26 – Apr 9 | May 21 – Jun 4 | — | — |
| Peppers Warning: Your frost-free season is about 79 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Apr 9 – Apr 23 | Jul 2 – Jul 16 | — | — |
| Eggplant Warning: Your frost-free season is about 79 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Apr 9 – Apr 23 | Jul 2 – Jul 16 | — | — |
| Tomatoes Warning: Your frost-free season is about 79 days, which is tight for tomatoes (70+ days). Choose early varieties and use transplants or row covers. | Apr 23 – May 7 | Jun 25 – Jul 9 | — | — |
| Lettuce | Apr 23 – May 7 | May 28 – Jun 11 | May 21 – Jun 25 | Jul 11 – Aug 8 |
| Kale | Apr 23 – May 7 | May 21 – Jun 4 | May 21 – Jun 4 | — |
| Broccoli | Apr 23 – May 7 | Jun 4 – Jun 18 | — | — |
| Cabbage | Apr 23 – May 7 | May 28 – Jun 11 | — | — |
| Cauliflower | Apr 23 – May 7 | Jun 4 – Jun 18 | — | — |
| Okra | May 7 – May 21 | Jul 9 – Jul 23 | Jul 9 – Jul 23 | — |
| Basil | May 7 – May 21 | Jun 25 – Jul 9 | — | — |
| Peas | — | — | May 7 – May 28 | — |
| Spinach | — | — | May 7 – May 28 | Jul 11 – Aug 1 |
| Radishes | — | — | May 14 – Jun 25 | Jul 25 – Aug 15 |
| Cucumbers | May 21 – May 28 | Jul 2 – Jul 9 | Jun 25 – Jul 9 | — |
| Zucchini & Summer Squash | May 21 – May 28 | — | Jun 25 – Jul 9 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 79 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 21 – May 28 | — | Jun 25 – Jul 9 | — |
| Melons & Watermelon Warning: Your frost-free season is about 79 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 21 – May 28 | Jul 2 – Jul 16 | — | — |
| Carrots | — | — | May 28 – Jun 25 | — |
| Beets | — | — | May 28 – Jun 25 | — |
| Potatoes | — | — | May 28 – Jun 18 | — |
| Swiss Chard | — | — | Jun 4 – Jul 2 | — |
| Cilantro | — | — | Jun 4 – Jun 25 | Jul 11 – Aug 1 |
| Green Beans | — | — | Jun 25 – Jul 16 | — |
| Sweet Corn Warning: Your frost-free season is about 79 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 25 – Jul 9 | — |
| Sweet Potatoes Warning: Your frost-free season is about 79 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jul 2 – Jul 23 | — | — |
| Garlic | — | — | — | Aug 22 – Sep 26 |
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 Tizer Gardens, MT weather station, 11 km away (elevation 4,672 ft (1,424 m)).
Frost dates near Clancy
- Jefferson City Jun 18 · Sep 5
- East Helena May 9 · Sep 30
- Helena May 9 · Sep 30
- Fort Harrison May 9 · Sep 30
- Basin Jun 7 · Sep 8
- Winston May 19 · Sep 19
- Boulder Jun 7 · Sep 8
- Elliston Jun 9 · Sep 8
- Radersburg May 19 · Sep 19
- Marysville Jun 4 · Sep 14
Frequently asked questions
When is the last frost in Clancy, MT?
The median last spring frost in Clancy, MT is June 18. There is still about a 10% chance of frost after July 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Clancy, MT?
The median first fall frost is September 5, with about a 10% chance of frost before August 21.
How long is the growing season in Clancy, MT?
About 79 days between the median last spring frost and first fall frost.
What planting zone is Clancy, MT?
Clancy, MT is in USDA hardiness zone 4b.