Martinsdale, MT frost dates
Last spring frostJun 3median date
First fall frostSep 8median date
Growing season97 daysfrost-free
Hardiness zone4bZone 4b
How Martinsdale compares
- In 8 years out of 10, the last spring frost in Martinsdale falls between May 20 and June 25, a 36-day window. The first fall frost falls between August 23 and September 23.
- The median last frost is 15 days later than the Montana median of May 19.
- Its 97-day growing season is longer than 9% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is 26 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 195 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 20 |
| 50% (median) | June 3 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 23 |
| 50% (median) | September 8 |
| 90% (late) | September 23 |
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 Martinsdale, MT
Martinsdale, MT frost dates — last frost Jun 3, first frost Sep 8, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 11 to Mar 25Transplant outside: May 6 to May 20
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27Sow outdoors: May 6 to Jun 10Plant for fall: Jul 14 to Aug 11
Start indoors: Apr 8 to Apr 22Transplant outside: May 6 to May 20Sow outdoors: May 6 to May 20Plant for fall: Jun 30 to Jul 21
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 22 to May 6Transplant outside: Jun 24 to Jul 8Sow outdoors: Jun 24 to Jul 8
Start indoors: Apr 22 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: Apr 22 to May 13
Sow outdoors: Apr 22 to May 13Plant for fall: Jul 14 to Aug 4
Sow outdoors: Apr 29 to Jun 10Plant for fall: Jul 28 to Aug 18
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jul 1
Sow outdoors: May 13 to Jun 10
Sow outdoors: May 13 to Jun 10Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 13 to Jun 3
Sow outdoors: May 20 to Jun 17
Sow outdoors: May 20 to Jun 10Plant for fall: Jul 14 to Aug 4
Sow outdoors: Jun 10 to Jul 1
Sow outdoors: Jun 10 to Jun 24
Transplant outside: Jun 17 to Jul 8
Plant for fall: Aug 25 to Sep 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Martinsdale, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 11 – Mar 25 | May 6 – May 20 | — | — |
| Peppers | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Eggplant | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Tomatoes | Apr 8 – Apr 22 | Jun 10 – Jun 24 | — | — |
| Lettuce | Apr 8 – Apr 22 | May 13 – May 27 | May 6 – Jun 10 | Jul 14 – Aug 11 |
| Kale | Apr 8 – Apr 22 | May 6 – May 20 | May 6 – May 20 | Jun 30 – Jul 21 |
| Broccoli | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Cabbage | Apr 8 – Apr 22 | May 13 – May 27 | — | — |
| Cauliflower | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Okra | Apr 22 – May 6 | Jun 24 – Jul 8 | Jun 24 – Jul 8 | — |
| Basil | Apr 22 – May 6 | Jun 10 – Jun 24 | — | — |
| Peas | — | — | Apr 22 – May 13 | — |
| Spinach | — | — | Apr 22 – May 13 | Jul 14 – Aug 4 |
| Radishes | — | — | Apr 29 – Jun 10 | Jul 28 – Aug 18 |
| Cucumbers | May 6 – May 13 | Jun 17 – Jun 24 | Jun 10 – Jun 24 | — |
| Zucchini & Summer Squash | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 97 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Melons & Watermelon Warning: Your frost-free season is about 97 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 6 – May 13 | Jun 17 – Jul 1 | — | — |
| Carrots | — | — | May 13 – Jun 10 | — |
| Beets | — | — | May 13 – Jun 10 | Jun 30 – Jul 14 |
| Potatoes | — | — | May 13 – Jun 3 | — |
| Swiss Chard | — | — | May 20 – Jun 17 | — |
| Cilantro | — | — | May 20 – Jun 10 | Jul 14 – Aug 4 |
| Green Beans | — | — | Jun 10 – Jul 1 | — |
| Sweet Corn | — | — | Jun 10 – Jun 24 | — |
| Sweet Potatoes Warning: Your frost-free season is about 97 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 17 – Jul 8 | — | — |
| Garlic | — | — | — | Aug 25 – Sep 29 |
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 Martinsdale 3 Nnw, MT weather station, 9 km away (elevation 4,800 ft (1,463 m)).
Frost dates near Martinsdale
- Two Dot May 23 · Sep 16
- Ringling frost any month
- Harlowton May 23 · Sep 16
- White Sulphur Springs Jun 4 · Sep 11
- Neihart Jun 6 · Sep 12
- Wilsall Jun 4 · Sep 6
- Buffalo Jun 1 · Sep 15
- Judith Gap Jun 1 · Sep 15
- Melville Jun 9 · Sep 7
- Shawmut May 23 · Sep 16
Frequently asked questions
When is the last frost in Martinsdale, MT?
The median last spring frost in Martinsdale, MT is June 3. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Martinsdale, MT?
The median first fall frost is September 8, with about a 10% chance of frost before August 23.
How long is the growing season in Martinsdale, MT?
About 97 days between the median last spring frost and first fall frost.
What planting zone is Martinsdale, MT?
Martinsdale, MT is in USDA hardiness zone 4b.