Neihart, MT frost dates
Last spring frostJun 6median date
First fall frostSep 12median date
Growing season98 daysfrost-free
Hardiness zone4bZone 4b
How Neihart compares
- In 8 years out of 10, the last spring frost in Neihart falls between May 23 and June 28, a 36-day window. The first fall frost falls between August 29 and September 27.
- The median last frost is 18 days later than the Montana median of May 19.
- Its 98-day growing season is longer than 10% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is 29 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 196 nights a year at or below 32°F.
- Compared with Great Falls, MT, 77 km away, the last frost here is 31 days later than there and the growing season is 50 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 23 |
| 50% (median) | June 6 |
| 10% (safe for tender plants) | June 28 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 29 |
| 50% (median) | September 12 |
| 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 Neihart, MT
Neihart, MT frost dates — last frost Jun 6, first frost Sep 12, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Mar 14 to Mar 28Transplant outside: May 9 to May 23
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Mar 28 to Apr 11Transplant outside: Jun 20 to Jul 4
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30Sow outdoors: May 9 to Jun 13Plant for fall: Jul 18 to Aug 15
Start indoors: Apr 11 to Apr 25Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 4 to Jul 25
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 11 to Apr 25Transplant outside: May 16 to May 30
Start indoors: Apr 11 to Apr 25Transplant outside: May 23 to Jun 6
Start indoors: Apr 25 to May 9Transplant outside: Jun 27 to Jul 11Sow outdoors: Jun 27 to Jul 11
Start indoors: Apr 25 to May 9Transplant outside: Jun 13 to Jun 27
Sow outdoors: Apr 25 to May 16
Sow outdoors: Apr 25 to May 16Plant for fall: Jul 18 to Aug 8
Sow outdoors: May 2 to Jun 13Plant for fall: Aug 1 to Aug 22
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Sow outdoors: Jun 13 to Jun 27
Start indoors: May 9 to May 16Transplant outside: Jun 20 to Jul 4
Sow outdoors: May 16 to Jun 13
Sow outdoors: May 16 to Jun 13Plant for fall: Jul 4 to Jul 18
Sow outdoors: May 16 to Jun 6
Sow outdoors: May 23 to Jun 20
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 18 to Aug 8
Sow outdoors: Jun 13 to Jul 4
Sow outdoors: Jun 13 to Jun 27
Transplant outside: Jun 20 to Jul 11
Plant for fall: Aug 29 to Oct 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Neihart, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 14 – Mar 28 | May 9 – May 23 | — | — |
| Peppers | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Eggplant | Mar 28 – Apr 11 | Jun 20 – Jul 4 | — | — |
| Tomatoes | Apr 11 – Apr 25 | Jun 13 – Jun 27 | — | — |
| Lettuce | Apr 11 – Apr 25 | May 16 – May 30 | May 9 – Jun 13 | Jul 18 – Aug 15 |
| Kale | Apr 11 – Apr 25 | May 9 – May 23 | May 9 – May 23 | Jul 4 – Jul 25 |
| Broccoli | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Cabbage | Apr 11 – Apr 25 | May 16 – May 30 | — | — |
| Cauliflower | Apr 11 – Apr 25 | May 23 – Jun 6 | — | — |
| Okra | Apr 25 – May 9 | Jun 27 – Jul 11 | Jun 27 – Jul 11 | — |
| Basil | Apr 25 – May 9 | Jun 13 – Jun 27 | — | — |
| Peas | — | — | Apr 25 – May 16 | — |
| Spinach | — | — | Apr 25 – May 16 | Jul 18 – Aug 8 |
| Radishes | — | — | May 2 – Jun 13 | Aug 1 – Aug 22 |
| Cucumbers | May 9 – May 16 | Jun 20 – Jun 27 | Jun 13 – Jun 27 | — |
| Zucchini & Summer Squash | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 98 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 9 – May 16 | — | Jun 13 – Jun 27 | — |
| Melons & Watermelon Warning: Your frost-free season is about 98 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 9 – May 16 | Jun 20 – Jul 4 | — | — |
| Carrots | — | — | May 16 – Jun 13 | — |
| Beets | — | — | May 16 – Jun 13 | Jul 4 – Jul 18 |
| Potatoes | — | — | May 16 – Jun 6 | — |
| Swiss Chard | — | — | May 23 – Jun 20 | — |
| Cilantro | — | — | May 23 – Jun 13 | Jul 18 – Aug 8 |
| Green Beans | — | — | Jun 13 – Jul 4 | — |
| Sweet Corn | — | — | Jun 13 – Jun 27 | — |
| Sweet Potatoes Warning: Your frost-free season is about 98 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 20 – Jul 11 | — | — |
| Garlic | — | — | — | Aug 29 – Oct 3 |
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 Neihart 8 Nnw, MT weather station, 12 km away (elevation 5,230 ft (1,594 m)).
Frost dates near Neihart
- Monarch Jun 6 · Sep 12
- Raynesford May 22 · Sep 23
- Geyser May 22 · Sep 23
- White Sulphur Springs Jun 4 · Sep 11
- Stanford May 25 · Sep 21
- Belt May 22 · Sep 23
- Stockett May 6 · Oct 1
- Martinsdale Jun 3 · Sep 8
- Sand Coulee May 6 · Oct 1
- Hobson May 28 · Sep 20
Frequently asked questions
When is the last frost in Neihart, MT?
The median last spring frost in Neihart, MT is June 6. There is still about a 10% chance of frost after June 28, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Neihart, MT?
The median first fall frost is September 12, with about a 10% chance of frost before August 29.
How long is the growing season in Neihart, MT?
About 98 days between the median last spring frost and first fall frost.
What planting zone is Neihart, MT?
Neihart, MT is in USDA hardiness zone 4b.