Grygla, MN frost dates
Last spring frostMay 20median date
First fall frostSep 17median date
Growing season120 daysfrost-free
Hardiness zone3bZone 3b
How Grygla compares
- In 8 years out of 10, the last spring frost in Grygla falls between May 5 and June 3, a 29-day window. The first fall frost falls between September 1 and October 2.
- The median last frost is 15 days later than the Minnesota median of May 5.
- Its 120-day growing season is longer than 4% of the 801 Minnesota places with a regular frost season (state median 151 days).
- The last frost is typical for zone 3b, where the median is May 17.
- The weather station records an average of 194 nights a year at or below 32°F.
- Compared with Grand Forks, ND, 113 km away, the last frost here is 10 days later than there and the growing season is 24 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 5 |
| 50% (median) | May 20 |
| 10% (safe for tender plants) | June 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 1 |
| 50% (median) | September 17 |
| 90% (late) | October 2 |
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 Grygla, MN
Grygla, MN frost dates — last frost May 20, first frost Sep 17, zone 3b. whenisthelastfrost.com
Crop
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Start indoors: Feb 25 to Mar 11Transplant outside: Apr 22 to May 6
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Sow outdoors: Apr 22 to May 27Plant for fall: Jul 23 to Aug 20
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 22 to May 6Sow outdoors: Apr 22 to May 6Plant for fall: Jul 9 to Jul 30
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jun 11 to Jul 2
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Plant for fall: Jun 11 to Jul 2
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jun 11 to Jul 2
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 27 to Jun 10
Sow outdoors: Apr 8 to Apr 29Plant for fall: Jun 25 to Jul 16
Sow outdoors: Apr 8 to Apr 29Plant for fall: Jul 23 to Aug 13
Sow outdoors: Apr 15 to May 27Plant for fall: Aug 6 to Aug 27
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 10Sow outdoors: May 27 to Jun 10Plant for fall: Jul 2 to Jul 16
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10Plant for fall: Jul 9 to Jul 23
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 29 to May 27Plant for fall: Jun 25 to Jul 9
Sow outdoors: Apr 29 to May 27Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 29 to May 20
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 6 to May 27Plant for fall: Jul 23 to Aug 13
Sow outdoors: May 27 to Jun 17Plant for fall: Jul 2 to Jul 16
Sow outdoors: May 27 to Jun 10
Transplant outside: Jun 3 to Jun 24
Plant for fall: Sep 3 to Oct 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Grygla, MN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 25 – Mar 11 | Apr 22 – May 6 | — | — |
| Peppers | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Eggplant | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Tomatoes | Mar 25 – Apr 8 | May 27 – Jun 10 | — | — |
| Lettuce | Mar 25 – Apr 8 | Apr 29 – May 13 | Apr 22 – May 27 | Jul 23 – Aug 20 |
| Kale | Mar 25 – Apr 8 | Apr 22 – May 6 | Apr 22 – May 6 | Jul 9 – Jul 30 |
| Broccoli | Mar 25 – Apr 8 | May 6 – May 20 | — | Jun 11 – Jul 2 |
| Cabbage | Mar 25 – Apr 8 | Apr 29 – May 13 | — | Jun 11 – Jul 2 |
| Cauliflower | Mar 25 – Apr 8 | May 6 – May 20 | — | Jun 11 – Jul 2 |
| Okra | Apr 8 – Apr 22 | Jun 10 – Jun 24 | Jun 10 – Jun 24 | — |
| Basil | Apr 8 – Apr 22 | May 27 – Jun 10 | — | — |
| Peas | — | — | Apr 8 – Apr 29 | Jun 25 – Jul 16 |
| Spinach | — | — | Apr 8 – Apr 29 | Jul 23 – Aug 13 |
| Radishes | — | — | Apr 15 – May 27 | Aug 6 – Aug 27 |
| Cucumbers | Apr 22 – Apr 29 | Jun 3 – Jun 10 | May 27 – Jun 10 | Jul 2 – Jul 16 |
| Zucchini & Summer Squash | Apr 22 – Apr 29 | — | May 27 – Jun 10 | Jul 9 – Jul 23 |
| Winter Squash & Pumpkins | Apr 22 – Apr 29 | — | May 27 – Jun 10 | — |
| Melons & Watermelon | Apr 22 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Carrots | — | — | Apr 29 – May 27 | Jun 25 – Jul 9 |
| Beets | — | — | Apr 29 – May 27 | Jul 9 – Jul 23 |
| Potatoes | — | — | Apr 29 – May 20 | — |
| Swiss Chard | — | — | May 6 – Jun 3 | Jul 9 – Jul 23 |
| Cilantro | — | — | May 6 – May 27 | Jul 23 – Aug 13 |
| Green Beans | — | — | May 27 – Jun 17 | Jul 2 – Jul 16 |
| Sweet Corn | — | — | May 27 – Jun 10 | — |
| Sweet Potatoes | — | Jun 3 – Jun 24 | — | — |
| Garlic | — | — | — | Sep 3 – Oct 8 |
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 Goodridge 12 Nnw, MN weather station, 17 km away (elevation 1,152 ft (351 m)).
Frost dates near Grygla
- Gatzke May 20 · Sep 17
- Goodridge May 20 · Sep 17
- Wannaska May 25 · Sep 22
- Middle River May 6 · Oct 3
- Strathcona May 6 · Oct 3
- Roseau May 16 · Sep 24
- Thief River Falls May 14 · Sep 28
- Newfolden May 14 · Sep 28
- Plummer May 9 · Sep 30
- Saint Hilaire May 14 · Sep 28
Frequently asked questions
When is the last frost in Grygla, MN?
The median last spring frost in Grygla, MN is May 20. There is still about a 10% chance of frost after June 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Grygla, MN?
The median first fall frost is September 17, with about a 10% chance of frost before September 1.
How long is the growing season in Grygla, MN?
About 120 days between the median last spring frost and first fall frost.
What planting zone is Grygla, MN?
Grygla, MN is in USDA hardiness zone 3b.