Donnybrook, ND frost dates
Last spring frostMay 11median date
First fall frostSep 29median date
Growing season141 daysfrost-free
Hardiness zone4aZone 4a
How Donnybrook compares
- In 8 years out of 10, the last spring frost in Donnybrook falls between April 28 and May 29, a 31-day window. The first fall frost falls between September 13 and October 13.
- The median last frost is 1 day earlier than the North Dakota median of May 12.
- Its 141-day growing season is longer than 63% of the 372 North Dakota places with a regular frost season (state median 139 days).
- The last frost is typical for zone 4a, where the median is May 12.
- The weather station records an average of 191 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 28 |
| 50% (median) | May 11 |
| 10% (safe for tender plants) | May 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 13 |
| 50% (median) | September 29 |
| 90% (late) | October 13 |
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 Donnybrook, ND
Donnybrook, ND frost dates — last frost May 11, first frost Sep 29, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Feb 16 to Mar 2Transplant outside: Apr 13 to Apr 27
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 16 to Mar 30Transplant outside: May 18 to Jun 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Sow outdoors: Apr 13 to May 18Plant for fall: Aug 4 to Sep 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 13 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Jul 21 to Aug 11
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jun 23 to Jul 14
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15Sow outdoors: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 18 to Jun 1
Sow outdoors: Mar 30 to Apr 20Plant for fall: Jul 7 to Jul 28
Sow outdoors: Mar 30 to Apr 20Plant for fall: Aug 4 to Aug 25
Sow outdoors: Apr 6 to May 18Plant for fall: Aug 18 to Sep 8
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 1Sow outdoors: May 18 to Jun 1Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 8
Sow outdoors: Apr 20 to May 18Plant for fall: Jul 7 to Jul 21
Sow outdoors: Apr 20 to May 18Plant for fall: Jul 21 to Aug 4
Sow outdoors: Apr 20 to May 11
Sow outdoors: Apr 27 to May 25Plant for fall: Jul 21 to Aug 4
Sow outdoors: Apr 27 to May 18Plant for fall: Aug 4 to Aug 25
Sow outdoors: May 18 to Jun 8Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 18 to Jun 1
Transplant outside: May 25 to Jun 15
Plant for fall: Sep 15 to Oct 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Donnybrook, ND
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 16 – Mar 2 | Apr 13 – Apr 27 | — | — |
| Peppers | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Eggplant | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Tomatoes | Mar 16 – Mar 30 | May 18 – Jun 1 | — | — |
| Lettuce | Mar 16 – Mar 30 | Apr 20 – May 4 | Apr 13 – May 18 | Aug 4 – Sep 1 |
| Kale | Mar 16 – Mar 30 | Apr 13 – Apr 27 | Apr 13 – Apr 27 | Jul 21 – Aug 11 |
| Broccoli | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jun 23 – Jul 14 |
| Cabbage | Mar 16 – Mar 30 | Apr 20 – May 4 | — | Jun 23 – Jul 14 |
| Cauliflower | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jun 23 – Jul 14 |
| Okra | Mar 30 – Apr 13 | Jun 1 – Jun 15 | Jun 1 – Jun 15 | — |
| Basil | Mar 30 – Apr 13 | May 18 – Jun 1 | — | — |
| Peas | — | — | Mar 30 – Apr 20 | Jul 7 – Jul 28 |
| Spinach | — | — | Mar 30 – Apr 20 | Aug 4 – Aug 25 |
| Radishes | — | — | Apr 6 – May 18 | Aug 18 – Sep 8 |
| Cucumbers | Apr 13 – Apr 20 | May 25 – Jun 1 | May 18 – Jun 1 | Jul 14 – Jul 28 |
| Zucchini & Summer Squash | Apr 13 – Apr 20 | — | May 18 – Jun 1 | Jul 21 – Aug 4 |
| Winter Squash & Pumpkins | Apr 13 – Apr 20 | — | May 18 – Jun 1 | — |
| Melons & Watermelon | Apr 13 – Apr 20 | May 25 – Jun 8 | — | — |
| Carrots | — | — | Apr 20 – May 18 | Jul 7 – Jul 21 |
| Beets | — | — | Apr 20 – May 18 | Jul 21 – Aug 4 |
| Potatoes | — | — | Apr 20 – May 11 | — |
| Swiss Chard | — | — | Apr 27 – May 25 | Jul 21 – Aug 4 |
| Cilantro | — | — | Apr 27 – May 18 | Aug 4 – Aug 25 |
| Green Beans | — | — | May 18 – Jun 8 | Jul 14 – Jul 28 |
| Sweet Corn | — | — | May 18 – Jun 1 | — |
| Sweet Potatoes | — | May 25 – Jun 15 | — | — |
| Garlic | — | — | — | Sep 15 – Oct 20 |
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 Foxholm 7 N, ND weather station, 24 km away (elevation 1,677 ft (511 m)).
Frost dates near Donnybrook
- Carpio May 11 · Sep 29
- Berthold May 11 · Sep 29
- Kenmare May 15 · Sep 23
- Palermo May 17 · Sep 23
- Mohall May 17 · Sep 23
- Tolley May 15 · Sep 23
- Des Lacs May 13 · Sep 27
- Lansford May 17 · Sep 23
- Stanley May 17 · Sep 23
- Burlington May 10 · Oct 1
Frequently asked questions
When is the last frost in Donnybrook, ND?
The median last spring frost in Donnybrook, ND is May 11. There is still about a 10% chance of frost after May 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Donnybrook, ND?
The median first fall frost is September 29, with about a 10% chance of frost before September 13.
How long is the growing season in Donnybrook, ND?
About 141 days between the median last spring frost and first fall frost.
What planting zone is Donnybrook, ND?
Donnybrook, ND is in USDA hardiness zone 4a.