Dover, MN frost dates
Last spring frostApr 30median date
First fall frostOct 6median date
Growing season159 daysfrost-free
Hardiness zone4bZone 4b
How Dover compares
- In 8 years out of 10, the last spring frost in Dover falls between April 15 and May 13, a 28-day window. The first fall frost falls between September 22 and October 20.
- The median last frost is 5 days earlier than the Minnesota median of May 5.
- Its 159-day growing season is longer than 77% of the 801 Minnesota places with a regular frost season (state median 151 days).
- The last frost is 8 days earlier than the zone 4b median of May 8. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4b chart.
- The weather station records an average of 156 nights a year at or below 32°F.
- Dover shares its weather station with Rochester, MN, 26 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 15 |
| 50% (median) | April 30 |
| 10% (safe for tender plants) | May 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 22 |
| 50% (median) | October 6 |
| 90% (late) | October 20 |
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 Dover, MN
Dover, MN frost dates — last frost Apr 30, first frost Oct 6, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 5 to Feb 19Transplant outside: Apr 2 to Apr 16
Start indoors: Feb 19 to Mar 5Transplant outside: May 14 to May 28
Start indoors: Feb 19 to Mar 5Transplant outside: May 14 to May 28
Start indoors: Mar 5 to Mar 19Transplant outside: May 7 to May 21
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 9 to Apr 23Sow outdoors: Apr 2 to May 7Plant for fall: Aug 11 to Sep 8
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 2 to Apr 16Sow outdoors: Apr 2 to Apr 16Plant for fall: Jul 28 to Aug 18
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 16 to Apr 30Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 9 to Apr 23Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 16 to Apr 30Plant for fall: Jun 30 to Jul 21
Start indoors: Mar 19 to Apr 2Transplant outside: May 21 to Jun 4Sow outdoors: May 21 to Jun 4
Start indoors: Mar 19 to Apr 2Transplant outside: May 7 to May 21
Sow outdoors: Mar 19 to Apr 9Plant for fall: Jul 14 to Aug 4
Sow outdoors: Mar 19 to Apr 9Plant for fall: Aug 11 to Sep 1
Sow outdoors: Mar 26 to May 7Plant for fall: Aug 25 to Sep 15
Start indoors: Apr 2 to Apr 9Transplant outside: May 14 to May 21Sow outdoors: May 7 to May 21Plant for fall: Jul 21 to Aug 4
Start indoors: Apr 2 to Apr 9Sow outdoors: May 7 to May 21Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 2 to Apr 9Sow outdoors: May 7 to May 21
Start indoors: Apr 2 to Apr 9Transplant outside: May 14 to May 28
Sow outdoors: Apr 9 to May 7Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 9 to May 7Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 9 to Apr 30
Sow outdoors: Apr 16 to May 14Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 16 to May 7Plant for fall: Aug 11 to Sep 1
Sow outdoors: May 7 to May 28Plant for fall: Jul 21 to Aug 4
Sow outdoors: May 7 to May 21
Transplant outside: May 14 to Jun 4
Plant for fall: Sep 22 to Oct 27
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Dover, MN
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 5 – Feb 19 | Apr 2 – Apr 16 | — | — |
| Peppers | Feb 19 – Mar 5 | May 14 – May 28 | — | — |
| Eggplant | Feb 19 – Mar 5 | May 14 – May 28 | — | — |
| Tomatoes | Mar 5 – Mar 19 | May 7 – May 21 | — | — |
| Lettuce | Mar 5 – Mar 19 | Apr 9 – Apr 23 | Apr 2 – May 7 | Aug 11 – Sep 8 |
| Kale | Mar 5 – Mar 19 | Apr 2 – Apr 16 | Apr 2 – Apr 16 | Jul 28 – Aug 18 |
| Broccoli | Mar 5 – Mar 19 | Apr 16 – Apr 30 | — | Jun 30 – Jul 21 |
| Cabbage | Mar 5 – Mar 19 | Apr 9 – Apr 23 | — | Jun 30 – Jul 21 |
| Cauliflower | Mar 5 – Mar 19 | Apr 16 – Apr 30 | — | Jun 30 – Jul 21 |
| Okra | Mar 19 – Apr 2 | May 21 – Jun 4 | May 21 – Jun 4 | — |
| Basil | Mar 19 – Apr 2 | May 7 – May 21 | — | — |
| Peas | — | — | Mar 19 – Apr 9 | Jul 14 – Aug 4 |
| Spinach | — | — | Mar 19 – Apr 9 | Aug 11 – Sep 1 |
| Radishes | — | — | Mar 26 – May 7 | Aug 25 – Sep 15 |
| Cucumbers | Apr 2 – Apr 9 | May 14 – May 21 | May 7 – May 21 | Jul 21 – Aug 4 |
| Zucchini & Summer Squash | Apr 2 – Apr 9 | — | May 7 – May 21 | Jul 28 – Aug 11 |
| Winter Squash & Pumpkins | Apr 2 – Apr 9 | — | May 7 – May 21 | — |
| Melons & Watermelon | Apr 2 – Apr 9 | May 14 – May 28 | — | — |
| Carrots | — | — | Apr 9 – May 7 | Jul 14 – Jul 28 |
| Beets | — | — | Apr 9 – May 7 | Jul 28 – Aug 11 |
| Potatoes | — | — | Apr 9 – Apr 30 | — |
| Swiss Chard | — | — | Apr 16 – May 14 | Jul 28 – Aug 11 |
| Cilantro | — | — | Apr 16 – May 7 | Aug 11 – Sep 1 |
| Green Beans | — | — | May 7 – May 28 | Jul 21 – Aug 4 |
| Sweet Corn | — | — | May 7 – May 21 | — |
| Sweet Potatoes | — | May 14 – Jun 4 | — | — |
| Garlic | — | — | — | Sep 22 – Oct 27 |
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 Rochester Intl Ap, MN weather station, 30 km away (elevation 1,306 ft (398 m)).
Frost dates near Dover
- Saint Charles Apr 23 · Oct 16
- Eyota Apr 30 · Oct 6
- Utica May 8 · Oct 3
- Elgin May 7 · Oct 2
- Plainview May 7 · Oct 2
- Chatfield May 14 · Sep 28
- Altura Apr 23 · Oct 16
- Lewiston Apr 21 · Oct 19
- Rochester Apr 30 · Oct 6
- Millville May 7 · Oct 2
Frequently asked questions
When is the last frost in Dover, MN?
The median last spring frost in Dover, MN is April 30. There is still about a 10% chance of frost after May 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Dover, MN?
The median first fall frost is October 6, with about a 10% chance of frost before September 22.
How long is the growing season in Dover, MN?
About 159 days between the median last spring frost and first fall frost.
What planting zone is Dover, MN?
Dover, MN is in USDA hardiness zone 4b.