Blair, WI frost dates
Last spring frostMay 9median date
First fall frostOct 1median date
Growing season145 daysfrost-free
Hardiness zone4bZone 4b
How Blair compares
- In 8 years out of 10, the last spring frost in Blair falls between April 28 and May 23, a 25-day window. The first fall frost falls between September 18 and October 11.
- The median last frost is 4 days later than the Wisconsin median of May 5.
- Its 145-day growing season is longer than 23% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is typical for zone 4b, where the median is May 8.
- The weather station records an average of 177 nights a year at or below 32°F.
- Compared with La Crosse, WI, 49 km away, the last frost here is 12 days later than there and the growing season is 24 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 28 |
| 50% (median) | May 9 |
| 10% (safe for tender plants) | May 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 18 |
| 50% (median) | October 1 |
| 90% (late) | October 11 |
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 Blair, WI
Blair, WI frost dates — last frost May 9, first frost Oct 1, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 14 to Feb 28Transplant outside: Apr 11 to Apr 25
Start indoors: Feb 28 to Mar 14Transplant outside: May 23 to Jun 6
Start indoors: Feb 28 to Mar 14Transplant outside: May 23 to Jun 6
Start indoors: Mar 14 to Mar 28Transplant outside: May 16 to May 30
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 18 to May 2Sow outdoors: Apr 11 to May 16Plant for fall: Aug 6 to Sep 3
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 11 to Apr 25Plant for fall: Jul 23 to Aug 13
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 25 to May 9Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 18 to May 2Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 14 to Mar 28Transplant outside: Apr 25 to May 9Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13Sow outdoors: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Mar 28 to Apr 18Plant for fall: Jul 9 to Jul 30
Sow outdoors: Mar 28 to Apr 18Plant for fall: Aug 6 to Aug 27
Sow outdoors: Apr 4 to May 16Plant for fall: Aug 20 to Sep 10
Start indoors: Apr 11 to Apr 18Transplant outside: May 23 to May 30Sow outdoors: May 16 to May 30Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 11 to Apr 18Sow outdoors: May 16 to May 30Plant for fall: Jul 23 to Aug 6
Start indoors: Apr 11 to Apr 18Sow outdoors: May 16 to May 30
Start indoors: Apr 11 to Apr 18Transplant outside: May 23 to Jun 6
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 18 to May 16Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 18 to May 9
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 6 to Aug 27
Sow outdoors: May 16 to Jun 6Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 16 to May 30
Transplant outside: May 23 to Jun 13
Plant for fall: Sep 17 to Oct 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Blair, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 14 – Feb 28 | Apr 11 – Apr 25 | — | — |
| Peppers | Feb 28 – Mar 14 | May 23 – Jun 6 | — | — |
| Eggplant | Feb 28 – Mar 14 | May 23 – Jun 6 | — | — |
| Tomatoes | Mar 14 – Mar 28 | May 16 – May 30 | — | — |
| Lettuce | Mar 14 – Mar 28 | Apr 18 – May 2 | Apr 11 – May 16 | Aug 6 – Sep 3 |
| Kale | Mar 14 – Mar 28 | Apr 11 – Apr 25 | Apr 11 – Apr 25 | Jul 23 – Aug 13 |
| Broccoli | Mar 14 – Mar 28 | Apr 25 – May 9 | — | Jun 25 – Jul 16 |
| Cabbage | Mar 14 – Mar 28 | Apr 18 – May 2 | — | Jun 25 – Jul 16 |
| Cauliflower | Mar 14 – Mar 28 | Apr 25 – May 9 | — | Jun 25 – Jul 16 |
| Okra | Mar 28 – Apr 11 | May 30 – Jun 13 | May 30 – Jun 13 | — |
| Basil | Mar 28 – Apr 11 | May 16 – May 30 | — | — |
| Peas | — | — | Mar 28 – Apr 18 | Jul 9 – Jul 30 |
| Spinach | — | — | Mar 28 – Apr 18 | Aug 6 – Aug 27 |
| Radishes | — | — | Apr 4 – May 16 | Aug 20 – Sep 10 |
| Cucumbers | Apr 11 – Apr 18 | May 23 – May 30 | May 16 – May 30 | Jul 16 – Jul 30 |
| Zucchini & Summer Squash | Apr 11 – Apr 18 | — | May 16 – May 30 | Jul 23 – Aug 6 |
| Winter Squash & Pumpkins | Apr 11 – Apr 18 | — | May 16 – May 30 | — |
| Melons & Watermelon | Apr 11 – Apr 18 | May 23 – Jun 6 | — | — |
| Carrots | — | — | Apr 18 – May 16 | Jul 9 – Jul 23 |
| Beets | — | — | Apr 18 – May 16 | Jul 23 – Aug 6 |
| Potatoes | — | — | Apr 18 – May 9 | — |
| Swiss Chard | — | — | Apr 25 – May 23 | Jul 23 – Aug 6 |
| Cilantro | — | — | Apr 25 – May 16 | Aug 6 – Aug 27 |
| Green Beans | — | — | May 16 – Jun 6 | Jul 16 – Jul 30 |
| Sweet Corn | — | — | May 16 – May 30 | — |
| Sweet Potatoes | — | May 23 – Jun 13 | — | — |
| Garlic | — | — | — | Sep 17 – Oct 22 |
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 Blair, WI weather station, about 1 km away (elevation 856 ft (261 m)).
Frost dates near Blair
- Taylor May 9 · Oct 1
- Whitehall May 9 · Oct 1
- Ettrick May 9 · Oct 1
- Pigeon Falls May 9 · Oct 1
- Hixton May 9 · Oct 1
- Arcadia May 5 · Oct 5
- Independence May 9 · Oct 1
- Melrose May 9 · Oct 1
- Galesville Apr 29 · Oct 11
- Alma Center May 9 · Oct 1
Frequently asked questions
When is the last frost in Blair, WI?
The median last spring frost in Blair, WI is May 9. There is still about a 10% chance of frost after May 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Blair, WI?
The median first fall frost is October 1, with about a 10% chance of frost before September 18.
How long is the growing season in Blair, WI?
About 145 days between the median last spring frost and first fall frost.
What planting zone is Blair, WI?
Blair, WI is in USDA hardiness zone 4b.