Killdeer, ND frost dates
Last spring frostMay 21median date
First fall frostSep 23median date
Growing season125 daysfrost-free
Hardiness zone4aZone 4a
How Killdeer compares
- In 8 years out of 10, the last spring frost in Killdeer falls between May 9 and June 5, a 27-day window. The first fall frost falls between September 8 and October 5.
- The median last frost is 9 days later than the North Dakota median of May 12.
- Its 125-day growing season is longer than 9% of the 372 North Dakota places with a regular frost season (state median 139 days).
- The last frost is 9 days later than the zone 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- 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) | May 9 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 8 |
| 50% (median) | September 23 |
| 90% (late) | October 5 |
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 Killdeer, ND
Killdeer, ND frost dates — last frost May 21, first frost Sep 23, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Jul 29 to Aug 26
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 17 to Jul 8
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 1 to Jul 22
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 29 to Aug 19
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 12 to Sep 2
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 8 to Jul 22
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 15 to Jul 29
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 1 to Jul 15
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 15 to Jul 29
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 7 to May 28Plant for fall: Jul 29 to Aug 19
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 8 to Jul 22
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 9 to Oct 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Killdeer, ND
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Jul 29 – Aug 26 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 15 – Aug 5 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 17 – Jul 8 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 17 – Jul 8 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 17 – Jul 8 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jul 1 – Jul 22 |
| Spinach | — | — | Apr 9 – Apr 30 | Jul 29 – Aug 19 |
| Radishes | — | — | Apr 16 – May 28 | Aug 12 – Sep 2 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 8 – Jul 22 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 15 – Jul 29 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jul 1 – Jul 15 |
| Beets | — | — | Apr 30 – May 28 | Jul 15 – Jul 29 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 15 – Jul 29 |
| Cilantro | — | — | May 7 – May 28 | Jul 29 – Aug 19 |
| Green Beans | — | — | May 28 – Jun 18 | Jul 8 – Jul 22 |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 9 – Oct 14 |
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 Killdeer, ND weather station, 5 km away (elevation 2,310 ft (704 m)).
Frost dates near Killdeer
- Dunn Center May 20 · Sep 21
- Manning May 18 · Sep 24
- Halliday May 20 · Sep 21
- Mandaree May 20 · Sep 20
- Grassy Butte May 18 · Sep 23
- Fairfield May 12 · Sep 28
- Dodge May 20 · Sep 21
- Marshall May 23 · Sep 20
- Golden Valley May 21 · Sep 20
- Watford City May 9 · Sep 27
Frequently asked questions
When is the last frost in Killdeer, ND?
The median last spring frost in Killdeer, ND is May 21. There is still about a 10% chance of frost after June 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Killdeer, ND?
The median first fall frost is September 23, with about a 10% chance of frost before September 8.
How long is the growing season in Killdeer, ND?
About 125 days between the median last spring frost and first fall frost.
What planting zone is Killdeer, ND?
Killdeer, ND is in USDA hardiness zone 4a.