Casco, WI frost dates
Last spring frostMay 1median date
First fall frostOct 18median date
Growing season170 daysfrost-free
Hardiness zone5bZone 5b
How Casco compares
- In 8 years out of 10, the last spring frost in Casco falls between April 16 and May 17, a 31-day window. The first fall frost falls between October 2 and November 1.
- The median last frost is 4 days earlier than the Wisconsin median of May 5.
- Its 170-day growing season is longer than 86% 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 145 nights a year at or below 32°F.
- Compared with Green Bay, WI, 33 km away, the last frost here is 1 day later than there and the growing season is 8 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 16 |
| 50% (median) | May 1 |
| 10% (safe for tender plants) | May 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 2 |
| 50% (median) | October 18 |
| 90% (late) | November 1 |
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 Casco, WI
Casco, WI frost dates — last frost May 1, first frost Oct 18, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 6 to Feb 20Transplant outside: Apr 3 to Apr 17
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Mar 6 to Mar 20Transplant outside: May 8 to May 22
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 3 to May 8Plant for fall: Aug 23 to Sep 20
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 3 to Apr 17Sow outdoors: Apr 3 to Apr 17Plant for fall: Aug 9 to Aug 30
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 12 to Aug 2
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 12 to Aug 2
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 12 to Aug 2
Start indoors: Mar 20 to Apr 3Transplant outside: May 22 to Jun 5Sow outdoors: May 22 to Jun 5
Start indoors: Mar 20 to Apr 3Transplant outside: May 8 to May 22
Sow outdoors: Mar 20 to Apr 10Plant for fall: Jul 26 to Aug 16
Sow outdoors: Mar 20 to Apr 10Plant for fall: Aug 23 to Sep 13
Sow outdoors: Mar 27 to May 8Plant for fall: Sep 6 to Sep 27
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 22Sow outdoors: May 8 to May 22Plant for fall: Aug 2 to Aug 16
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22Plant for fall: Aug 9 to Aug 23
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 29
Sow outdoors: Apr 10 to May 8Plant for fall: Jul 26 to Aug 9
Sow outdoors: Apr 10 to May 8Plant for fall: Aug 9 to Aug 23
Sow outdoors: Apr 10 to May 1
Sow outdoors: Apr 17 to May 15Plant for fall: Aug 9 to Aug 23
Sow outdoors: Apr 17 to May 8Plant for fall: Aug 23 to Sep 13
Sow outdoors: May 8 to May 29Plant for fall: Aug 2 to Aug 16
Sow outdoors: May 8 to May 22
Transplant outside: May 15 to Jun 5
Plant for fall: Oct 4 to Nov 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Casco, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 6 – Feb 20 | Apr 3 – Apr 17 | — | — |
| Peppers | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Eggplant | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Tomatoes | Mar 6 – Mar 20 | May 8 – May 22 | — | — |
| Lettuce | Mar 6 – Mar 20 | Apr 10 – Apr 24 | Apr 3 – May 8 | Aug 23 – Sep 20 |
| Kale | Mar 6 – Mar 20 | Apr 3 – Apr 17 | Apr 3 – Apr 17 | Aug 9 – Aug 30 |
| Broccoli | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 12 – Aug 2 |
| Cabbage | Mar 6 – Mar 20 | Apr 10 – Apr 24 | — | Jul 12 – Aug 2 |
| Cauliflower | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 12 – Aug 2 |
| Okra | Mar 20 – Apr 3 | May 22 – Jun 5 | May 22 – Jun 5 | — |
| Basil | Mar 20 – Apr 3 | May 8 – May 22 | — | — |
| Peas | — | — | Mar 20 – Apr 10 | Jul 26 – Aug 16 |
| Spinach | — | — | Mar 20 – Apr 10 | Aug 23 – Sep 13 |
| Radishes | — | — | Mar 27 – May 8 | Sep 6 – Sep 27 |
| Cucumbers | Apr 3 – Apr 10 | May 15 – May 22 | May 8 – May 22 | Aug 2 – Aug 16 |
| Zucchini & Summer Squash | Apr 3 – Apr 10 | — | May 8 – May 22 | Aug 9 – Aug 23 |
| Winter Squash & Pumpkins | Apr 3 – Apr 10 | — | May 8 – May 22 | — |
| Melons & Watermelon | Apr 3 – Apr 10 | May 15 – May 29 | — | — |
| Carrots | — | — | Apr 10 – May 8 | Jul 26 – Aug 9 |
| Beets | — | — | Apr 10 – May 8 | Aug 9 – Aug 23 |
| Potatoes | — | — | Apr 10 – May 1 | — |
| Swiss Chard | — | — | Apr 17 – May 15 | Aug 9 – Aug 23 |
| Cilantro | — | — | Apr 17 – May 8 | Aug 23 – Sep 13 |
| Green Beans | — | — | May 8 – May 29 | Aug 2 – Aug 16 |
| Sweet Corn | — | — | May 8 – May 22 | — |
| Sweet Potatoes | — | May 15 – Jun 5 | — | — |
| Garlic | — | — | — | Oct 4 – Nov 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 Kewaunee, WI weather station, 16 km away (elevation 594 ft (181 m)).
Frost dates near Casco
- Luxemburg May 1 · Oct 18
- Algoma May 6 · Oct 17
- Forestville May 6 · Oct 17
- New Franken May 7 · Oct 9
- Kewaunee May 1 · Oct 18
- Brussels May 6 · Oct 17
- Maplewood May 6 · Oct 17
- Tisch Mills May 6 · Oct 12
- Denmark May 6 · Oct 12
- Suamico May 7 · Oct 9
Frequently asked questions
When is the last frost in Casco, WI?
The median last spring frost in Casco, WI is May 1. There is still about a 10% chance of frost after May 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Casco, WI?
The median first fall frost is October 18, with about a 10% chance of frost before October 2.
How long is the growing season in Casco, WI?
About 170 days between the median last spring frost and first fall frost.
What planting zone is Casco, WI?
Casco, WI is in USDA hardiness zone 5b.