Moore, MT frost dates
Last spring frostMay 23median date
First fall frostSep 21median date
Growing season121 daysfrost-free
Hardiness zone4bZone 4b
How Moore compares
- In 8 years out of 10, the last spring frost in Moore falls between May 11 and June 8, a 28-day window. The first fall frost falls between September 8 and October 3.
- The median last frost is 4 days later than the Montana median of May 19.
- Its 121-day growing season is longer than 35% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is 15 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 184 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 11 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 8 |
| 50% (median) | September 21 |
| 90% (late) | October 3 |
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 Moore, MT
Moore, MT frost dates — last frost May 23, first frost Sep 21, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Jul 27 to Aug 24
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 13 to Aug 3
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 15 to Jul 6
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 15 to Jul 6
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 15 to Jul 6
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jun 29 to Jul 20
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 27 to Aug 17
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 10 to Aug 31
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 6 to Jul 20
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 13 to Jul 27
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jun 29 to Jul 13
Sow outdoors: May 2 to May 30Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 9 to May 30Plant for fall: Jul 27 to Aug 17
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 7 to Oct 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Moore, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Jul 27 – Aug 24 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 13 – Aug 3 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 15 – Jul 6 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 15 – Jul 6 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 15 – Jul 6 |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jun 29 – Jul 20 |
| Spinach | — | — | Apr 11 – May 2 | Jul 27 – Aug 17 |
| Radishes | — | — | Apr 18 – May 30 | Aug 10 – Aug 31 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 6 – Jul 20 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 13 – Jul 27 |
| Winter Squash & Pumpkins | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jun 29 – Jul 13 |
| Beets | — | — | May 2 – May 30 | Jul 13 – Jul 27 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 13 – Jul 27 |
| Cilantro | — | — | May 9 – May 30 | Jul 27 – Aug 17 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 6 – Jul 20 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 7 – Oct 12 |
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 Lewistown Muni Ap, MT weather station, 20 km away (elevation 4,144 ft (1,263 m)).
Frost dates near Moore
- Hobson May 28 · Sep 20
- Moccasin May 28 · Sep 20
- Buffalo Jun 1 · Sep 15
- Lewistown May 14 · Sep 28
- Judith Gap Jun 1 · Sep 15
- Hilger May 14 · Sep 28
- Denton Jun 1 · Sep 11
- Stanford May 25 · Sep 21
- Forest Grove May 19 · Sep 25
- Coffee Creek Jun 1 · Sep 11
Frequently asked questions
When is the last frost in Moore, MT?
The median last spring frost in Moore, MT is May 23. There is still about a 10% chance of frost after June 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Moore, MT?
The median first fall frost is September 21, with about a 10% chance of frost before September 8.
How long is the growing season in Moore, MT?
About 121 days between the median last spring frost and first fall frost.
What planting zone is Moore, MT?
Moore, MT is in USDA hardiness zone 4b.