Poplar, WI frost dates
Last spring frostMay 24median date
First fall frostSep 26median date
Growing season125 daysfrost-free
Hardiness zone4bZone 4b
How Poplar compares
- In 8 years out of 10, the last spring frost in Poplar falls between May 8 and June 6, a 29-day window. The first fall frost falls between September 9 and October 9.
- The median last frost is 19 days later than the Wisconsin median of May 5.
- Its 125-day growing season is longer than 5% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is 16 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 190 nights a year at or below 32°F.
- Compared with Duluth, MN, 33 km away, the last frost here is 10 days later than there and the growing season is 26 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 8 |
| 50% (median) | May 24 |
| 10% (safe for tender plants) | June 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 9 |
| 50% (median) | September 26 |
| 90% (late) | October 9 |
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 Poplar, WI
Poplar, WI frost dates — last frost May 24, first frost Sep 26, zone 4b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 1 to Mar 15Transplant outside: Apr 26 to May 10
Start indoors: Mar 15 to Mar 29Transplant outside: Jun 7 to Jun 21
Start indoors: Mar 15 to Mar 29Transplant outside: Jun 7 to Jun 21
Start indoors: Mar 29 to Apr 12Transplant outside: May 31 to Jun 14
Start indoors: Mar 29 to Apr 12Transplant outside: May 3 to May 17Sow outdoors: Apr 26 to May 31Plant for fall: Aug 1 to Aug 29
Start indoors: Mar 29 to Apr 12Transplant outside: Apr 26 to May 10Sow outdoors: Apr 26 to May 10Plant for fall: Jul 18 to Aug 8
Start indoors: Mar 29 to Apr 12Transplant outside: May 10 to May 24Plant for fall: Jun 20 to Jul 11
Start indoors: Mar 29 to Apr 12Transplant outside: May 3 to May 17Plant for fall: Jun 20 to Jul 11
Start indoors: Mar 29 to Apr 12Transplant outside: May 10 to May 24Plant for fall: Jun 20 to Jul 11
Start indoors: Apr 12 to Apr 26Transplant outside: Jun 14 to Jun 28Sow outdoors: Jun 14 to Jun 28
Start indoors: Apr 12 to Apr 26Transplant outside: May 31 to Jun 14
Sow outdoors: Apr 12 to May 3Plant for fall: Jul 4 to Jul 25
Sow outdoors: Apr 12 to May 3Plant for fall: Aug 1 to Aug 22
Sow outdoors: Apr 19 to May 31Plant for fall: Aug 15 to Sep 5
Start indoors: Apr 26 to May 3Transplant outside: Jun 7 to Jun 14Sow outdoors: May 31 to Jun 14Plant for fall: Jul 11 to Jul 25
Start indoors: Apr 26 to May 3Sow outdoors: May 31 to Jun 14Plant for fall: Jul 18 to Aug 1
Start indoors: Apr 26 to May 3Sow outdoors: May 31 to Jun 14
Start indoors: Apr 26 to May 3Transplant outside: Jun 7 to Jun 21
Sow outdoors: May 3 to May 31Plant for fall: Jul 4 to Jul 18
Sow outdoors: May 3 to May 31Plant for fall: Jul 18 to Aug 1
Sow outdoors: May 3 to May 24
Sow outdoors: May 10 to Jun 7Plant for fall: Jul 18 to Aug 1
Sow outdoors: May 10 to May 31Plant for fall: Aug 1 to Aug 22
Sow outdoors: May 31 to Jun 21Plant for fall: Jul 11 to Jul 25
Sow outdoors: May 31 to Jun 14
Transplant outside: Jun 7 to Jun 28
Plant for fall: Sep 12 to Oct 17
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Poplar, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 1 – Mar 15 | Apr 26 – May 10 | — | — |
| Peppers | Mar 15 – Mar 29 | Jun 7 – Jun 21 | — | — |
| Eggplant | Mar 15 – Mar 29 | Jun 7 – Jun 21 | — | — |
| Tomatoes | Mar 29 – Apr 12 | May 31 – Jun 14 | — | — |
| Lettuce | Mar 29 – Apr 12 | May 3 – May 17 | Apr 26 – May 31 | Aug 1 – Aug 29 |
| Kale | Mar 29 – Apr 12 | Apr 26 – May 10 | Apr 26 – May 10 | Jul 18 – Aug 8 |
| Broccoli | Mar 29 – Apr 12 | May 10 – May 24 | — | Jun 20 – Jul 11 |
| Cabbage | Mar 29 – Apr 12 | May 3 – May 17 | — | Jun 20 – Jul 11 |
| Cauliflower | Mar 29 – Apr 12 | May 10 – May 24 | — | Jun 20 – Jul 11 |
| Okra | Apr 12 – Apr 26 | Jun 14 – Jun 28 | Jun 14 – Jun 28 | — |
| Basil | Apr 12 – Apr 26 | May 31 – Jun 14 | — | — |
| Peas | — | — | Apr 12 – May 3 | Jul 4 – Jul 25 |
| Spinach | — | — | Apr 12 – May 3 | Aug 1 – Aug 22 |
| Radishes | — | — | Apr 19 – May 31 | Aug 15 – Sep 5 |
| Cucumbers | Apr 26 – May 3 | Jun 7 – Jun 14 | May 31 – Jun 14 | Jul 11 – Jul 25 |
| Zucchini & Summer Squash | Apr 26 – May 3 | — | May 31 – Jun 14 | Jul 18 – Aug 1 |
| Winter Squash & Pumpkins | Apr 26 – May 3 | — | May 31 – Jun 14 | — |
| Melons & Watermelon | Apr 26 – May 3 | Jun 7 – Jun 21 | — | — |
| Carrots | — | — | May 3 – May 31 | Jul 4 – Jul 18 |
| Beets | — | — | May 3 – May 31 | Jul 18 – Aug 1 |
| Potatoes | — | — | May 3 – May 24 | — |
| Swiss Chard | — | — | May 10 – Jun 7 | Jul 18 – Aug 1 |
| Cilantro | — | — | May 10 – May 31 | Aug 1 – Aug 22 |
| Green Beans | — | — | May 31 – Jun 21 | Jul 11 – Jul 25 |
| Sweet Corn | — | — | May 31 – Jun 14 | — |
| Sweet Potatoes | — | Jun 7 – Jun 28 | — | — |
| Garlic | — | — | — | Sep 12 – Oct 17 |
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 Brule Rs, WI weather station, 18 km away (elevation 1,001 ft (305 m)).
Frost dates near Poplar
- South Range May 18 · Oct 3
- Hawthorne May 12 · Oct 2
- Lake Nebagamon May 24 · Sep 26
- Maple May 24 · Sep 26
- Solon Springs May 12 · Oct 2
- Brule May 24 · Sep 26
- Superior May 6 · Oct 9
- Foxboro May 18 · Oct 3
- Iron River May 24 · Sep 26
- Gordon May 22 · Sep 26
Frequently asked questions
When is the last frost in Poplar, WI?
The median last spring frost in Poplar, WI is May 24. There is still about a 10% chance of frost after June 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Poplar, WI?
The median first fall frost is September 26, with about a 10% chance of frost before September 9.
How long is the growing season in Poplar, WI?
About 125 days between the median last spring frost and first fall frost.
What planting zone is Poplar, WI?
Poplar, WI is in USDA hardiness zone 4b.