Keewatin, MN frost dates
Last spring frostJun 5median date
First fall frostSep 8median date
Growing season95 daysfrost-free
Hardiness zone4aZone 4a
How Keewatin compares
- In 8 years out of 10, the last spring frost in Keewatin falls between May 22 and June 25, a 34-day window. The first fall frost falls between August 23 and September 23.
- The median last frost is 31 days later than the Minnesota median of May 5.
- Its 95-day growing season is among the shortest of the 801 Minnesota places with a regular frost season.
- The last frost is 24 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 205 nights a year at or below 32°F.
- Compared with Duluth, MN, 99 km away, the last frost here is 22 days later than there and the growing season is 56 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 22 |
| 50% (median) | June 5 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 23 |
| 50% (median) | September 8 |
| 90% (late) | September 23 |
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 Keewatin, MN
Keewatin, MN frost dates — last frost Jun 5, first frost Sep 8, zone 4a. whenisthelastfrost.com
Crop
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Start indoors: Mar 13 to Mar 27Transplant outside: May 8 to May 22
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29Sow outdoors: May 8 to Jun 12Plant for fall: Jul 14 to Aug 11
Start indoors: Apr 10 to Apr 24Transplant outside: May 8 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jun 30 to Jul 21
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 24 to May 8Transplant outside: Jun 26 to Jul 10Sow outdoors: Jun 26 to Jul 10
Start indoors: Apr 24 to May 8Transplant outside: Jun 12 to Jun 26
Sow outdoors: Apr 24 to May 15
Sow outdoors: Apr 24 to May 15Plant for fall: Jul 14 to Aug 4
Sow outdoors: May 1 to Jun 12Plant for fall: Jul 28 to Aug 18
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jul 3
Sow outdoors: May 15 to Jun 12
Sow outdoors: May 15 to Jun 12Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 15 to Jun 5
Sow outdoors: May 22 to Jun 19
Sow outdoors: May 22 to Jun 12Plant for fall: Jul 14 to Aug 4
Sow outdoors: Jun 12 to Jul 3
Sow outdoors: Jun 12 to Jun 26
Transplant outside: Jun 19 to Jul 10
Plant for fall: Aug 25 to Sep 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Keewatin, MN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 13 – Mar 27 | May 8 – May 22 | — | — |
| Peppers | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Eggplant | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Tomatoes | Apr 10 – Apr 24 | Jun 12 – Jun 26 | — | — |
| Lettuce | Apr 10 – Apr 24 | May 15 – May 29 | May 8 – Jun 12 | Jul 14 – Aug 11 |
| Kale | Apr 10 – Apr 24 | May 8 – May 22 | May 8 – May 22 | Jun 30 – Jul 21 |
| Broccoli | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Cabbage | Apr 10 – Apr 24 | May 15 – May 29 | — | — |
| Cauliflower | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Okra | Apr 24 – May 8 | Jun 26 – Jul 10 | Jun 26 – Jul 10 | — |
| Basil | Apr 24 – May 8 | Jun 12 – Jun 26 | — | — |
| Peas | — | — | Apr 24 – May 15 | — |
| Spinach | — | — | Apr 24 – May 15 | Jul 14 – Aug 4 |
| Radishes | — | — | May 1 – Jun 12 | Jul 28 – Aug 18 |
| Cucumbers | May 8 – May 15 | Jun 19 – Jun 26 | Jun 12 – Jun 26 | — |
| Zucchini & Summer Squash | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 95 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Melons & Watermelon Warning: Your frost-free season is about 95 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 8 – May 15 | Jun 19 – Jul 3 | — | — |
| Carrots | — | — | May 15 – Jun 12 | — |
| Beets | — | — | May 15 – Jun 12 | Jun 30 – Jul 14 |
| Potatoes | — | — | May 15 – Jun 5 | — |
| Swiss Chard | — | — | May 22 – Jun 19 | — |
| Cilantro | — | — | May 22 – Jun 12 | Jul 14 – Aug 4 |
| Green Beans | — | — | Jun 12 – Jul 3 | — |
| Sweet Corn | — | — | Jun 12 – Jun 26 | — |
| Sweet Potatoes Warning: Your frost-free season is about 95 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 19 – Jul 10 | — | — |
| Garlic | — | — | — | Aug 25 – Sep 29 |
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 Hibbing Chisholm Hibbing Ap, MN weather station, 18 km away (elevation 1,352 ft (412 m)).
Frost dates near Keewatin
- Nashwauk Jun 5 · Sep 8
- Hibbing Jun 5 · Sep 8
- Pengilly May 17 · Sep 24
- Calumet May 17 · Sep 24
- Marble May 17 · Sep 24
- Chisholm Jun 5 · Sep 8
- Goodland May 17 · Sep 24
- Taconite May 17 · Sep 24
- Bovey May 17 · Sep 24
- Buhl Jun 5 · Sep 8
Frequently asked questions
When is the last frost in Keewatin, MN?
The median last spring frost in Keewatin, MN is June 5. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Keewatin, MN?
The median first fall frost is September 8, with about a 10% chance of frost before August 23.
How long is the growing season in Keewatin, MN?
About 95 days between the median last spring frost and first fall frost.
What planting zone is Keewatin, MN?
Keewatin, MN is in USDA hardiness zone 4a.