Darien, WI frost dates
Last spring frostApr 28median date
First fall frostOct 14median date
Growing season169 daysfrost-free
Hardiness zone5bZone 5b
How Darien compares
- In 8 years out of 10, the last spring frost in Darien falls between April 12 and May 14, a 32-day window. The first fall frost falls between September 28 and October 26.
- The median last frost is 7 days earlier than the Wisconsin median of May 5.
- Its 169-day growing season is longer than 84% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is typical for zone 5b, where the median is May 1.
- The weather station records an average of 143 nights a year at or below 32°F.
- Compared with Janesville, WI, 27 km away, the last frost here is 2 days later than there and the growing season is 3 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 12 |
| 50% (median) | April 28 |
| 10% (safe for tender plants) | May 14 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 28 |
| 50% (median) | October 14 |
| 90% (late) | October 26 |
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 Darien, WI
Darien, WI frost dates — last frost Apr 28, first frost Oct 14, zone 5b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 3 to Feb 17Transplant outside: Mar 31 to Apr 14
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Mar 3 to Mar 17Transplant outside: May 5 to May 19
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Sow outdoors: Mar 31 to May 5Plant for fall: Aug 19 to Sep 16
Start indoors: Mar 3 to Mar 17Transplant outside: Mar 31 to Apr 14Sow outdoors: Mar 31 to Apr 14Plant for fall: Aug 5 to Aug 26
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 8 to Jul 29
Start indoors: Mar 17 to Mar 31Transplant outside: May 19 to Jun 2Sow outdoors: May 19 to Jun 2
Start indoors: Mar 17 to Mar 31Transplant outside: May 5 to May 19
Sow outdoors: Mar 17 to Apr 7Plant for fall: Jul 22 to Aug 12
Sow outdoors: Mar 17 to Apr 7Plant for fall: Aug 19 to Sep 9
Sow outdoors: Mar 24 to May 5Plant for fall: Sep 2 to Sep 23
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 19Sow outdoors: May 5 to May 19Plant for fall: Jul 29 to Aug 12
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19Plant for fall: Aug 5 to Aug 19
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Apr 7 to May 5Plant for fall: Jul 22 to Aug 5
Sow outdoors: Apr 7 to May 5Plant for fall: Aug 5 to Aug 19
Sow outdoors: Apr 7 to Apr 28
Sow outdoors: Apr 14 to May 12Plant for fall: Aug 5 to Aug 19
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 19 to Sep 9
Sow outdoors: May 5 to May 26Plant for fall: Jul 29 to Aug 12
Sow outdoors: May 5 to May 19
Transplant outside: May 12 to Jun 2
Plant for fall: Sep 30 to Nov 4
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Darien, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 3 – Feb 17 | Mar 31 – Apr 14 | — | — |
| Peppers | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Eggplant | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Tomatoes | Mar 3 – Mar 17 | May 5 – May 19 | — | — |
| Lettuce | Mar 3 – Mar 17 | Apr 7 – Apr 21 | Mar 31 – May 5 | Aug 19 – Sep 16 |
| Kale | Mar 3 – Mar 17 | Mar 31 – Apr 14 | Mar 31 – Apr 14 | Aug 5 – Aug 26 |
| Broccoli | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 8 – Jul 29 |
| Cabbage | Mar 3 – Mar 17 | Apr 7 – Apr 21 | — | Jul 8 – Jul 29 |
| Cauliflower | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 8 – Jul 29 |
| Okra | Mar 17 – Mar 31 | May 19 – Jun 2 | May 19 – Jun 2 | — |
| Basil | Mar 17 – Mar 31 | May 5 – May 19 | — | — |
| Peas | — | — | Mar 17 – Apr 7 | Jul 22 – Aug 12 |
| Spinach | — | — | Mar 17 – Apr 7 | Aug 19 – Sep 9 |
| Radishes | — | — | Mar 24 – May 5 | Sep 2 – Sep 23 |
| Cucumbers | Mar 31 – Apr 7 | May 12 – May 19 | May 5 – May 19 | Jul 29 – Aug 12 |
| Zucchini & Summer Squash | Mar 31 – Apr 7 | — | May 5 – May 19 | Aug 5 – Aug 19 |
| Winter Squash & Pumpkins | Mar 31 – Apr 7 | — | May 5 – May 19 | — |
| Melons & Watermelon | Mar 31 – Apr 7 | May 12 – May 26 | — | — |
| Carrots | — | — | Apr 7 – May 5 | Jul 22 – Aug 5 |
| Beets | — | — | Apr 7 – May 5 | Aug 5 – Aug 19 |
| Potatoes | — | — | Apr 7 – Apr 28 | — |
| Swiss Chard | — | — | Apr 14 – May 12 | Aug 5 – Aug 19 |
| Cilantro | — | — | Apr 14 – May 5 | Aug 19 – Sep 9 |
| Green Beans | — | — | May 5 – May 26 | Jul 29 – Aug 12 |
| Sweet Corn | — | — | May 5 – May 19 | — |
| Sweet Potatoes | — | May 12 – Jun 2 | — | — |
| Garlic | — | — | — | Sep 30 – Nov 4 |
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 Delavan Wwtp, WI weather station, 9 km away (elevation 883 ft (269 m)).
Frost dates near Darien
- Sharon Apr 30 · Oct 10
- Avalon Apr 30 · Oct 10
- Delavan Apr 28 · Oct 14
- Clinton Apr 30 · Oct 10
- Walworth Apr 28 · Oct 14
- Fontana Apr 28 · Oct 14
- Williams Bay Apr 25 · Oct 21
- Elkhorn Apr 28 · Oct 14
- Zenda Apr 25 · Oct 21
- Lake Geneva Apr 25 · Oct 21
Frequently asked questions
When is the last frost in Darien, WI?
The median last spring frost in Darien, WI is April 28. There is still about a 10% chance of frost after May 14, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Darien, WI?
The median first fall frost is October 14, with about a 10% chance of frost before September 28.
How long is the growing season in Darien, WI?
About 169 days between the median last spring frost and first fall frost.
What planting zone is Darien, WI?
Darien, WI is in USDA hardiness zone 5b.