Frost dates for 59106 — Billings, MT
Last spring frostMay 5median date
First fall frostOct 3median date
Growing season151 daysfrost-free
Hardiness zone5aZone 5a
How Billings compares
- In 8 years out of 10, the last spring frost in Billings falls between April 23 and May 21, a 28-day window. The first fall frost falls between September 20 and October 17.
- The median last frost is 14 days earlier than the Montana median of May 19.
- Its 151-day growing season is longer than 95% of the 325 Montana places with a regular frost season (state median 125 days).
- The last frost is typical for zone 5a, where the median is May 3.
- The weather station records an average of 158 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 23 |
| 50% (median) | May 5 |
| 10% (safe for tender plants) | May 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 20 |
| 50% (median) | October 3 |
| 90% (late) | October 17 |
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 Billings, MT
Frost dates for 59106 — Billings, MT — last frost May 5, first frost Oct 3, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 10 to Feb 24Transplant outside: Apr 7 to Apr 21
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Feb 24 to Mar 10Transplant outside: May 19 to Jun 2
Start indoors: Mar 10 to Mar 24Transplant outside: May 12 to May 26
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 7 to May 12Plant for fall: Aug 8 to Sep 5
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 7 to Apr 21Sow outdoors: Apr 7 to Apr 21Plant for fall: Jul 25 to Aug 15
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 14 to Apr 28Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 10 to Mar 24Transplant outside: Apr 21 to May 5Plant for fall: Jun 27 to Jul 18
Start indoors: Mar 24 to Apr 7Transplant outside: May 26 to Jun 9Sow outdoors: May 26 to Jun 9
Start indoors: Mar 24 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Mar 24 to Apr 14Plant for fall: Jul 11 to Aug 1
Sow outdoors: Mar 24 to Apr 14Plant for fall: Aug 8 to Aug 29
Sow outdoors: Mar 31 to May 12Plant for fall: Aug 22 to Sep 12
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to May 26Sow outdoors: May 12 to May 26Plant for fall: Jul 18 to Aug 1
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26Plant for fall: Jul 25 to Aug 8
Start indoors: Apr 7 to Apr 14Sow outdoors: May 12 to May 26
Start indoors: Apr 7 to Apr 14Transplant outside: May 19 to Jun 2
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 11 to Jul 25
Sow outdoors: Apr 14 to May 12Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 14 to May 5
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 21 to May 12Plant for fall: Aug 8 to Aug 29
Sow outdoors: May 12 to Jun 2Plant for fall: Jul 18 to Aug 1
Sow outdoors: May 12 to May 26
Transplant outside: May 19 to Jun 9
Plant for fall: Sep 19 to Oct 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Billings, MT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 10 – Feb 24 | Apr 7 – Apr 21 | — | — |
| Peppers | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Eggplant | Feb 24 – Mar 10 | May 19 – Jun 2 | — | — |
| Tomatoes | Mar 10 – Mar 24 | May 12 – May 26 | — | — |
| Lettuce | Mar 10 – Mar 24 | Apr 14 – Apr 28 | Apr 7 – May 12 | Aug 8 – Sep 5 |
| Kale | Mar 10 – Mar 24 | Apr 7 – Apr 21 | Apr 7 – Apr 21 | Jul 25 – Aug 15 |
| Broccoli | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 27 – Jul 18 |
| Cabbage | Mar 10 – Mar 24 | Apr 14 – Apr 28 | — | Jun 27 – Jul 18 |
| Cauliflower | Mar 10 – Mar 24 | Apr 21 – May 5 | — | Jun 27 – Jul 18 |
| Okra | Mar 24 – Apr 7 | May 26 – Jun 9 | May 26 – Jun 9 | — |
| Basil | Mar 24 – Apr 7 | May 12 – May 26 | — | — |
| Peas | — | — | Mar 24 – Apr 14 | Jul 11 – Aug 1 |
| Spinach | — | — | Mar 24 – Apr 14 | Aug 8 – Aug 29 |
| Radishes | — | — | Mar 31 – May 12 | Aug 22 – Sep 12 |
| Cucumbers | Apr 7 – Apr 14 | May 19 – May 26 | May 12 – May 26 | Jul 18 – Aug 1 |
| Zucchini & Summer Squash | Apr 7 – Apr 14 | — | May 12 – May 26 | Jul 25 – Aug 8 |
| Winter Squash & Pumpkins | Apr 7 – Apr 14 | — | May 12 – May 26 | — |
| Melons & Watermelon | Apr 7 – Apr 14 | May 19 – Jun 2 | — | — |
| Carrots | — | — | Apr 14 – May 12 | Jul 11 – Jul 25 |
| Beets | — | — | Apr 14 – May 12 | Jul 25 – Aug 8 |
| Potatoes | — | — | Apr 14 – May 5 | — |
| Swiss Chard | — | — | Apr 21 – May 19 | Jul 25 – Aug 8 |
| Cilantro | — | — | Apr 21 – May 12 | Aug 8 – Aug 29 |
| Green Beans | — | — | May 12 – Jun 2 | Jul 18 – Aug 1 |
| Sweet Corn | — | — | May 12 – May 26 | — |
| Sweet Potatoes | — | May 19 – Jun 9 | — | — |
| Garlic | — | — | — | Sep 19 – Oct 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 Billings Wfo, MT weather station, 7 km away (elevation 3,186 ft (971 m)).
ZIP codes in Billings: 59101 59102 59103 59104 59105 59106 59107 59108 59111 59112 59114 59115 59116 59117
Frost dates near Billings
- Laurel May 5 · Oct 3
- Acton May 4 · Oct 7
- Molt May 24 · Sep 21
- Park City May 29 · Sep 15
- Shepherd May 12 · Sep 25
- Huntley May 12 · Sep 25
- Broadview May 22 · Sep 15
- Edgar May 29 · Sep 15
Frequently asked questions
When is the last frost in Billings, MT?
The median last spring frost in Billings, MT is May 5. There is still about a 10% chance of frost after May 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Billings, MT?
The median first fall frost is October 3, with about a 10% chance of frost before September 20.
How long is the growing season in Billings, MT?
About 151 days between the median last spring frost and first fall frost.
What planting zone is Billings, MT?
Billings, MT is in USDA hardiness zone 5a.