Caledonia, WI frost dates
Last spring frostApr 22median date
First fall frostOct 26median date
Growing season187 daysfrost-free
Hardiness zone5bZone 5b
How Caledonia compares
- In 8 years out of 10, the last spring frost in Caledonia falls between April 9 and May 8, a 29-day window. The first fall frost falls between October 10 and November 8.
- The median last frost is 13 days earlier than the Wisconsin median of May 5.
- Its 187-day growing season is among the longest of the 749 Wisconsin places with a regular frost season.
- The last frost is 9 days earlier than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 124 nights a year at or below 32°F.
- Compared with Racine, WI, 16 km away, the last frost here is 2 days later than there and the growing season is the same length.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 9 |
| 50% (median) | April 22 |
| 10% (safe for tender plants) | May 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 10 |
| 50% (median) | October 26 |
| 90% (late) | November 8 |
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 Caledonia, WI
Caledonia, WI frost dates — last frost Apr 22, first frost Oct 26, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Jan 28 to Feb 11Transplant outside: Mar 25 to Apr 8
Start indoors: Feb 11 to Feb 25Transplant outside: May 6 to May 20
Start indoors: Feb 11 to Feb 25Transplant outside: May 6 to May 20
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 29 to May 13
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 1 to Apr 15Sow outdoors: Mar 25 to Apr 29Plant for fall: Aug 31 to Sep 28
Start indoors: Feb 25 to Mar 11Transplant outside: Mar 25 to Apr 8Sow outdoors: Mar 25 to Apr 8Plant for fall: Aug 17 to Sep 7
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 8 to Apr 22Plant for fall: Jul 20 to Aug 10
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 1 to Apr 15Plant for fall: Jul 20 to Aug 10
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 8 to Apr 22Plant for fall: Jul 20 to Aug 10
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27Sow outdoors: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 29 to May 13
Sow outdoors: Mar 11 to Apr 1Plant for fall: Aug 3 to Aug 24
Sow outdoors: Mar 11 to Apr 1Plant for fall: Aug 31 to Sep 21
Sow outdoors: Mar 18 to Apr 29Plant for fall: Sep 14 to Oct 5
Start indoors: Mar 25 to Apr 1Transplant outside: May 6 to May 13Sow outdoors: Apr 29 to May 13Plant for fall: Aug 10 to Aug 24
Start indoors: Mar 25 to Apr 1Sow outdoors: Apr 29 to May 13Plant for fall: Aug 17 to Aug 31
Start indoors: Mar 25 to Apr 1Sow outdoors: Apr 29 to May 13
Start indoors: Mar 25 to Apr 1Transplant outside: May 6 to May 20
Sow outdoors: Apr 1 to Apr 29Plant for fall: Aug 3 to Aug 17
Sow outdoors: Apr 1 to Apr 29Plant for fall: Aug 17 to Aug 31
Sow outdoors: Apr 1 to Apr 22
Sow outdoors: Apr 8 to May 6Plant for fall: Aug 17 to Aug 31
Sow outdoors: Apr 8 to Apr 29Plant for fall: Aug 31 to Sep 21
Sow outdoors: Apr 29 to May 20Plant for fall: Aug 10 to Aug 24
Sow outdoors: Apr 29 to May 13
Transplant outside: May 6 to May 27
Plant for fall: Oct 12 to Nov 16
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Caledonia, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 28 – Feb 11 | Mar 25 – Apr 8 | — | — |
| Peppers | Feb 11 – Feb 25 | May 6 – May 20 | — | — |
| Eggplant | Feb 11 – Feb 25 | May 6 – May 20 | — | — |
| Tomatoes | Feb 25 – Mar 11 | Apr 29 – May 13 | — | — |
| Lettuce | Feb 25 – Mar 11 | Apr 1 – Apr 15 | Mar 25 – Apr 29 | Aug 31 – Sep 28 |
| Kale | Feb 25 – Mar 11 | Mar 25 – Apr 8 | Mar 25 – Apr 8 | Aug 17 – Sep 7 |
| Broccoli | Feb 25 – Mar 11 | Apr 8 – Apr 22 | — | Jul 20 – Aug 10 |
| Cabbage | Feb 25 – Mar 11 | Apr 1 – Apr 15 | — | Jul 20 – Aug 10 |
| Cauliflower | Feb 25 – Mar 11 | Apr 8 – Apr 22 | — | Jul 20 – Aug 10 |
| Okra | Mar 11 – Mar 25 | May 13 – May 27 | May 13 – May 27 | — |
| Basil | Mar 11 – Mar 25 | Apr 29 – May 13 | — | — |
| Peas | — | — | Mar 11 – Apr 1 | Aug 3 – Aug 24 |
| Spinach | — | — | Mar 11 – Apr 1 | Aug 31 – Sep 21 |
| Radishes | — | — | Mar 18 – Apr 29 | Sep 14 – Oct 5 |
| Cucumbers | Mar 25 – Apr 1 | May 6 – May 13 | Apr 29 – May 13 | Aug 10 – Aug 24 |
| Zucchini & Summer Squash | Mar 25 – Apr 1 | — | Apr 29 – May 13 | Aug 17 – Aug 31 |
| Winter Squash & Pumpkins | Mar 25 – Apr 1 | — | Apr 29 – May 13 | — |
| Melons & Watermelon | Mar 25 – Apr 1 | May 6 – May 20 | — | — |
| Carrots | — | — | Apr 1 – Apr 29 | Aug 3 – Aug 17 |
| Beets | — | — | Apr 1 – Apr 29 | Aug 17 – Aug 31 |
| Potatoes | — | — | Apr 1 – Apr 22 | — |
| Swiss Chard | — | — | Apr 8 – May 6 | Aug 17 – Aug 31 |
| Cilantro | — | — | Apr 8 – Apr 29 | Aug 31 – Sep 21 |
| Green Beans | — | — | Apr 29 – May 20 | Aug 10 – Aug 24 |
| Sweet Corn | — | — | Apr 29 – May 13 | — |
| Sweet Potatoes | — | May 6 – May 27 | — | — |
| Garlic | — | — | — | Oct 12 – Nov 16 |
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 South Milwaukee Wwtp, WI weather station, 10 km away (elevation 650 ft (198 m)).
Frost dates near Caledonia
- Oak Creek Apr 22 · Oct 26
- Franksville May 5 · Oct 8
- South Milwaukee Apr 22 · Oct 26
- Franklin May 3 · Oct 14
- Greendale May 3 · Oct 14
- Cudahy Apr 19 · Oct 29
- Sturtevant Apr 20 · Oct 24
- Hales Corners May 3 · Oct 14
- Racine Apr 20 · Oct 24
- Saint Francis Apr 19 · Oct 29
Frequently asked questions
When is the last frost in Caledonia, WI?
The median last spring frost in Caledonia, WI is April 22. There is still about a 10% chance of frost after May 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Caledonia, WI?
The median first fall frost is October 26, with about a 10% chance of frost before October 10.
How long is the growing season in Caledonia, WI?
About 187 days between the median last spring frost and first fall frost.
What planting zone is Caledonia, WI?
Caledonia, WI is in USDA hardiness zone 5b.