Pendroy, MT frost dates
Last spring frostJun 9median date
First fall frostSep 3median date
Growing season86 daysfrost-free
Hardiness zone4bZone 4b
How Pendroy compares
- In 8 years out of 10, the last spring frost in Pendroy falls between May 25 and July 2, a 38-day window. The first fall frost falls between August 19 and September 18.
- The median last frost is 21 days later than the Montana median of May 19.
- Its 86-day growing season is among the shortest of the 325 Montana places with a regular frost season.
- The last frost is 32 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 207 nights a year at or below 32°F.
- Compared with Great Falls, MT, 100 km away, the last frost here is 34 days later than there and the growing season is 62 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 25 |
| 50% (median) | June 9 |
| 10% (safe for tender plants) | July 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 19 |
| 50% (median) | September 3 |
| 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 Pendroy, MT
Pendroy, MT frost dates — last frost Jun 9, first frost Sep 3, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 17 to Mar 31Transplant outside: May 12 to May 26
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 23 to Jul 7
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 23 to Jul 7
Start indoors: Apr 14 to Apr 28Transplant outside: Jun 16 to Jun 30
Start indoors: Apr 14 to Apr 28Transplant outside: May 19 to Jun 2Sow outdoors: May 12 to Jun 16Plant for fall: Jul 9 to Aug 6
Start indoors: Apr 14 to Apr 28Transplant outside: May 12 to May 26Sow outdoors: May 12 to May 26Plant for fall: Jun 25 to Jul 16
Start indoors: Apr 14 to Apr 28Transplant outside: May 26 to Jun 9
Start indoors: Apr 14 to Apr 28Transplant outside: May 19 to Jun 2
Start indoors: Apr 14 to Apr 28Transplant outside: May 26 to Jun 9
Start indoors: Apr 28 to May 12Transplant outside: Jun 30 to Jul 14Sow outdoors: Jun 30 to Jul 14
Start indoors: Apr 28 to May 12Transplant outside: Jun 16 to Jun 30
Sow outdoors: Apr 28 to May 19
Sow outdoors: Apr 28 to May 19Plant for fall: Jul 9 to Jul 30
Sow outdoors: May 5 to Jun 16Plant for fall: Jul 23 to Aug 13
Start indoors: May 12 to May 19Transplant outside: Jun 23 to Jun 30Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Sow outdoors: Jun 16 to Jun 30
Start indoors: May 12 to May 19Transplant outside: Jun 23 to Jul 7
Sow outdoors: May 19 to Jun 16
Sow outdoors: May 19 to Jun 16
Sow outdoors: May 19 to Jun 9
Sow outdoors: May 26 to Jun 23
Sow outdoors: May 26 to Jun 16Plant for fall: Jul 9 to Jul 30
Sow outdoors: Jun 16 to Jul 7
Sow outdoors: Jun 16 to Jun 30
Transplant outside: Jun 23 to Jul 14
Plant for fall: Aug 20 to Sep 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pendroy, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 17 – Mar 31 | May 12 – May 26 | — | — |
| Peppers Warning: Your frost-free season is about 86 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Mar 31 – Apr 14 | Jun 23 – Jul 7 | — | — |
| Eggplant Warning: Your frost-free season is about 86 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Mar 31 – Apr 14 | Jun 23 – Jul 7 | — | — |
| Tomatoes | Apr 14 – Apr 28 | Jun 16 – Jun 30 | — | — |
| Lettuce | Apr 14 – Apr 28 | May 19 – Jun 2 | May 12 – Jun 16 | Jul 9 – Aug 6 |
| Kale | Apr 14 – Apr 28 | May 12 – May 26 | May 12 – May 26 | Jun 25 – Jul 16 |
| Broccoli | Apr 14 – Apr 28 | May 26 – Jun 9 | — | — |
| Cabbage | Apr 14 – Apr 28 | May 19 – Jun 2 | — | — |
| Cauliflower | Apr 14 – Apr 28 | May 26 – Jun 9 | — | — |
| Okra | Apr 28 – May 12 | Jun 30 – Jul 14 | Jun 30 – Jul 14 | — |
| Basil | Apr 28 – May 12 | Jun 16 – Jun 30 | — | — |
| Peas | — | — | Apr 28 – May 19 | — |
| Spinach | — | — | Apr 28 – May 19 | Jul 9 – Jul 30 |
| Radishes | — | — | May 5 – Jun 16 | Jul 23 – Aug 13 |
| Cucumbers | May 12 – May 19 | Jun 23 – Jun 30 | Jun 16 – Jun 30 | — |
| Zucchini & Summer Squash | May 12 – May 19 | — | Jun 16 – Jun 30 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 86 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 12 – May 19 | — | Jun 16 – Jun 30 | — |
| Melons & Watermelon Warning: Your frost-free season is about 86 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 12 – May 19 | Jun 23 – Jul 7 | — | — |
| Carrots | — | — | May 19 – Jun 16 | — |
| Beets | — | — | May 19 – Jun 16 | — |
| Potatoes | — | — | May 19 – Jun 9 | — |
| Swiss Chard | — | — | May 26 – Jun 23 | — |
| Cilantro | — | — | May 26 – Jun 16 | Jul 9 – Jul 30 |
| Green Beans | — | — | Jun 16 – Jul 7 | — |
| Sweet Corn Warning: Your frost-free season is about 86 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 16 – Jun 30 | — |
| Sweet Potatoes Warning: Your frost-free season is about 86 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 23 – Jul 14 | — | — |
| Garlic | — | — | — | Aug 20 – Sep 24 |
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 Blackleaf, MT weather station, 12 km away (elevation 4,236 ft (1,291 m)).
Frost dates near Pendroy
- Bynum May 16 · Sep 27
- Dupuyer Jun 9 · Sep 3
- Valier May 17 · Sep 24
- Choteau May 28 · Sep 12
- Conrad May 20 · Sep 19
- Brady May 20 · Sep 19
- Heart Butte Jun 8 · Sep 5
- Dutton May 20 · Sep 22
- Ethridge May 24 · Sep 15
- Fairfield May 13 · Sep 27
Frequently asked questions
When is the last frost in Pendroy, MT?
The median last spring frost in Pendroy, MT is June 9. There is still about a 10% chance of frost after July 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pendroy, MT?
The median first fall frost is September 3, with about a 10% chance of frost before August 19.
How long is the growing season in Pendroy, MT?
About 86 days between the median last spring frost and first fall frost.
What planting zone is Pendroy, MT?
Pendroy, MT is in USDA hardiness zone 4b.