Cornucopia, WI frost dates
Last spring frostMay 23median date
First fall frostOct 2median date
Growing season132 daysfrost-free
Hardiness zone4bZone 4b
How Cornucopia compares
- In 8 years out of 10, the last spring frost in Cornucopia falls between May 8 and June 5, a 28-day window. The first fall frost falls between September 17 and October 16.
- The median last frost is 18 days later than the Wisconsin median of May 5.
- Its 132-day growing season is longer than 10% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is 15 days later 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 185 nights a year at or below 32°F.
- Compared with Duluth, MN, 79 km away, the last frost here is 9 days later than there and the growing season is 19 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 17 |
| 50% (median) | October 2 |
| 90% (late) | October 16 |
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 Cornucopia, WI
Cornucopia, WI frost dates — last frost May 23, first frost Oct 2, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Aug 7 to Sep 4
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 26 to Jul 17
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 10 to Jul 31
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 7 to Aug 28
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 21 to Sep 11
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 17 to Jul 31
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 24 to Aug 7
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jul 10 to Jul 24
Sow outdoors: May 2 to May 30Plant for fall: Jul 24 to Aug 7
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 24 to Aug 7
Sow outdoors: May 9 to May 30Plant for fall: Aug 7 to Aug 28
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 18 to Oct 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Cornucopia, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Aug 7 – Sep 4 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 24 – Aug 14 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 26 – Jul 17 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 26 – Jul 17 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 26 – Jul 17 |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jul 10 – Jul 31 |
| Spinach | — | — | Apr 11 – May 2 | Aug 7 – Aug 28 |
| Radishes | — | — | Apr 18 – May 30 | Aug 21 – Sep 11 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 17 – Jul 31 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 24 – Aug 7 |
| Winter Squash & Pumpkins | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jul 10 – Jul 24 |
| Beets | — | — | May 2 – May 30 | Jul 24 – Aug 7 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 24 – Aug 7 |
| Cilantro | — | — | May 9 – May 30 | Aug 7 – Aug 28 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 17 – Jul 31 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 18 – Oct 23 |
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 Bayfield Fish Hatchery, WI weather station, 19 km away (elevation 617 ft (188 m)).
Frost dates near Cornucopia
- Herbster May 31 · Oct 2
- Bayfield May 20 · Oct 8
- Washburn May 23 · Oct 2
- Port Wing May 31 · Oct 2
- Benoit May 23 · Sep 29
- La Pointe May 20 · Oct 9
- Iron River May 24 · Sep 26
- Ashland May 20 · Oct 2
- Mason May 20 · Oct 1
- Brule May 24 · Sep 26
Frequently asked questions
When is the last frost in Cornucopia, WI?
The median last spring frost in Cornucopia, WI is May 23. There is still about a 10% chance of frost after June 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Cornucopia, WI?
The median first fall frost is October 2, with about a 10% chance of frost before September 17.
How long is the growing season in Cornucopia, WI?
About 132 days between the median last spring frost and first fall frost.
What planting zone is Cornucopia, WI?
Cornucopia, WI is in USDA hardiness zone 4b.