Gilby, ND frost dates
Last spring frostMay 16median date
First fall frostSep 27median date
Growing season134 daysfrost-free
Hardiness zone4aZone 4a
How Gilby compares
- In 8 years out of 10, the last spring frost in Gilby falls between May 3 and May 31, a 28-day window. The first fall frost falls between September 15 and October 8.
- The median last frost is 4 days later than the North Dakota median of May 12.
- Its 134-day growing season is longer than 31% of the 372 North Dakota places with a regular frost season (state median 139 days).
- The last frost is 4 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 185 nights a year at or below 32°F.
- Compared with Grand Forks, ND, 36 km away, the last frost here is 6 days later than there and the growing season is 10 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 3 |
| 50% (median) | May 16 |
| 10% (safe for tender plants) | May 31 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 15 |
| 50% (median) | September 27 |
| 90% (late) | October 8 |
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 Gilby, ND
Gilby, ND frost dates — last frost May 16, first frost Sep 27, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Feb 21 to Mar 7Transplant outside: Apr 18 to May 2
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Sow outdoors: Apr 18 to May 23Plant for fall: Aug 2 to Aug 30
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 18 to May 2Sow outdoors: Apr 18 to May 2Plant for fall: Jul 19 to Aug 9
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Plant for fall: Jun 21 to Jul 12
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 21 to Jul 12
Start indoors: Apr 4 to Apr 18Transplant outside: Jun 6 to Jun 20Sow outdoors: Jun 6 to Jun 20
Start indoors: Apr 4 to Apr 18Transplant outside: May 23 to Jun 6
Sow outdoors: Apr 4 to Apr 25Plant for fall: Jul 5 to Jul 26
Sow outdoors: Apr 4 to Apr 25Plant for fall: Aug 2 to Aug 23
Sow outdoors: Apr 11 to May 23Plant for fall: Aug 16 to Sep 6
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 6Sow outdoors: May 23 to Jun 6Plant for fall: Jul 12 to Jul 26
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 5 to Jul 19
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 19 to Aug 2
Sow outdoors: Apr 25 to May 16
Sow outdoors: May 2 to May 30Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 2 to May 23Plant for fall: Aug 2 to Aug 23
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 23 to Jun 6
Transplant outside: May 30 to Jun 20
Plant for fall: Sep 13 to Oct 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Gilby, ND
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 21 – Mar 7 | Apr 18 – May 2 | — | — |
| Peppers | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Eggplant | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Tomatoes | Mar 21 – Apr 4 | May 23 – Jun 6 | — | — |
| Lettuce | Mar 21 – Apr 4 | Apr 25 – May 9 | Apr 18 – May 23 | Aug 2 – Aug 30 |
| Kale | Mar 21 – Apr 4 | Apr 18 – May 2 | Apr 18 – May 2 | Jul 19 – Aug 9 |
| Broccoli | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 21 – Jul 12 |
| Cabbage | Mar 21 – Apr 4 | Apr 25 – May 9 | — | Jun 21 – Jul 12 |
| Cauliflower | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 21 – Jul 12 |
| Okra | Apr 4 – Apr 18 | Jun 6 – Jun 20 | Jun 6 – Jun 20 | — |
| Basil | Apr 4 – Apr 18 | May 23 – Jun 6 | — | — |
| Peas | — | — | Apr 4 – Apr 25 | Jul 5 – Jul 26 |
| Spinach | — | — | Apr 4 – Apr 25 | Aug 2 – Aug 23 |
| Radishes | — | — | Apr 11 – May 23 | Aug 16 – Sep 6 |
| Cucumbers | Apr 18 – Apr 25 | May 30 – Jun 6 | May 23 – Jun 6 | Jul 12 – Jul 26 |
| Zucchini & Summer Squash | Apr 18 – Apr 25 | — | May 23 – Jun 6 | Jul 19 – Aug 2 |
| Winter Squash & Pumpkins | Apr 18 – Apr 25 | — | May 23 – Jun 6 | — |
| Melons & Watermelon | Apr 18 – Apr 25 | May 30 – Jun 13 | — | — |
| Carrots | — | — | Apr 25 – May 23 | Jul 5 – Jul 19 |
| Beets | — | — | Apr 25 – May 23 | Jul 19 – Aug 2 |
| Potatoes | — | — | Apr 25 – May 16 | — |
| Swiss Chard | — | — | May 2 – May 30 | Jul 19 – Aug 2 |
| Cilantro | — | — | May 2 – May 23 | Aug 2 – Aug 23 |
| Green Beans | — | — | May 23 – Jun 13 | Jul 12 – Jul 26 |
| Sweet Corn | — | — | May 23 – Jun 6 | — |
| Sweet Potatoes | — | May 30 – Jun 20 | — | — |
| Garlic | — | — | — | Sep 13 – Oct 18 |
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 Grand Forks Intl Ap, ND weather station, 27 km away (elevation 843 ft (257 m)).
Frost dates near Gilby
- Mekinock May 16 · Sep 27
- Inkster May 11 · Sep 28
- Forest River May 4 · Oct 7
- Grand Forks Afb May 16 · Sep 27
- Arvilla May 11 · Sep 28
- Manvel May 16 · Sep 27
- Larimore May 11 · Sep 28
- Minto May 4 · Oct 7
- Emerado May 16 · Sep 27
- Fordville May 11 · Sep 28
Frequently asked questions
When is the last frost in Gilby, ND?
The median last spring frost in Gilby, ND is May 16. There is still about a 10% chance of frost after May 31, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Gilby, ND?
The median first fall frost is September 27, with about a 10% chance of frost before September 15.
How long is the growing season in Gilby, ND?
About 134 days between the median last spring frost and first fall frost.
What planting zone is Gilby, ND?
Gilby, ND is in USDA hardiness zone 4a.