Williams, MN frost dates
Last spring frostMay 25median date
First fall frostSep 22median date
Growing season120 daysfrost-free
Hardiness zone3bZone 3b
How Williams compares
- In 8 years out of 10, the last spring frost in Williams falls between May 9 and June 6, a 28-day window. The first fall frost falls between September 5 and October 4.
- The median last frost is 20 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 8 days later than the zone 3b median of May 17. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 3b chart.
- The weather station records an average of 199 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 25 |
| 10% (safe for tender plants) | June 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 5 |
| 50% (median) | September 22 |
| 90% (late) | October 4 |
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 Williams, MN
Williams, MN frost dates — last frost May 25, first frost Sep 22, zone 3b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 27 to May 11
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Sow outdoors: Apr 27 to Jun 1Plant for fall: Jul 28 to Aug 25
Start indoors: Mar 30 to Apr 13Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 13 to May 4Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 20 to Jun 1Plant for fall: Aug 11 to Sep 1
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 15Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: May 4 to Jun 1Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 4 to May 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 11 to Jun 1Plant for fall: Jul 28 to Aug 18
Sow outdoors: Jun 1 to Jun 22Plant for fall: Jul 7 to Jul 21
Sow outdoors: Jun 1 to Jun 15
Transplant outside: Jun 8 to Jun 29
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Williams, MN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 2 – Mar 16 | Apr 27 – May 11 | — | — |
| Peppers | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Eggplant | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Tomatoes | Mar 30 – Apr 13 | Jun 1 – Jun 15 | — | — |
| Lettuce | Mar 30 – Apr 13 | May 4 – May 18 | Apr 27 – Jun 1 | Jul 28 – Aug 25 |
| Kale | Mar 30 – Apr 13 | Apr 27 – May 11 | Apr 27 – May 11 | Jul 14 – Aug 4 |
| Broccoli | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 16 – Jul 7 |
| Cabbage | Mar 30 – Apr 13 | May 4 – May 18 | — | Jun 16 – Jul 7 |
| Cauliflower | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 16 – Jul 7 |
| Okra | Apr 13 – Apr 27 | Jun 15 – Jun 29 | Jun 15 – Jun 29 | — |
| Basil | Apr 13 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Peas | — | — | Apr 13 – May 4 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 13 – May 4 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 20 – Jun 1 | Aug 11 – Sep 1 |
| Cucumbers | Apr 27 – May 4 | Jun 8 – Jun 15 | Jun 1 – Jun 15 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | Apr 27 – May 4 | — | Jun 1 – Jun 15 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | Apr 27 – May 4 | — | Jun 1 – Jun 15 | — |
| Melons & Watermelon | Apr 27 – May 4 | Jun 8 – Jun 22 | — | — |
| Carrots | — | — | May 4 – Jun 1 | Jun 30 – Jul 14 |
| Beets | — | — | May 4 – Jun 1 | Jul 14 – Jul 28 |
| Potatoes | — | — | May 4 – May 25 | — |
| Swiss Chard | — | — | May 11 – Jun 8 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 11 – Jun 1 | Jul 28 – Aug 18 |
| Green Beans | — | — | Jun 1 – Jun 22 | Jul 7 – Jul 21 |
| Sweet Corn | — | — | Jun 1 – Jun 15 | — |
| Sweet Potatoes | — | Jun 8 – Jun 29 | — | — |
| Garlic | — | — | — | Sep 8 – Oct 13 |
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 Camp Norris Dnr, MN weather station, 27 km away (elevation 1,289 ft (393 m)).
Frost dates near Williams
- Roosevelt May 16 · Sep 24
- Swift May 16 · Sep 24
- Baudette May 14 · Sep 26
- Warroad May 16 · Sep 24
- Salol May 16 · Sep 24
- Oak Island May 16 · Sep 24
- Wannaska May 25 · Sep 22
- Roseau May 16 · Sep 24
- Angle Inlet May 16 · Sep 24
- Birchdale May 14 · Sep 26
Frequently asked questions
When is the last frost in Williams, MN?
The median last spring frost in Williams, MN is May 25. There is still about a 10% chance of frost after June 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Williams, MN?
The median first fall frost is September 22, with about a 10% chance of frost before September 5.
How long is the growing season in Williams, MN?
About 120 days between the median last spring frost and first fall frost.
What planting zone is Williams, MN?
Williams, MN is in USDA hardiness zone 3b.