Rhinelander, WI frost dates
Last spring frostMay 23median date
First fall frostSep 23median date
Growing season123 daysfrost-free
Hardiness zone4bZone 4b
How Rhinelander compares
- In 8 years out of 10, the last spring frost in Rhinelander falls between May 7 and June 5, a 29-day window. The first fall frost falls between September 7 and October 6.
- The median last frost is 18 days later than the Wisconsin median of May 5.
- Its 123-day growing season is longer than 3% 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 197 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 7 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 7 |
| 50% (median) | September 23 |
| 90% (late) | October 6 |
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 Rhinelander, WI
Rhinelander, WI frost dates — last frost May 23, first frost Sep 23, 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: Jul 29 to Aug 26
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 17 to Jul 8
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 17 to Jul 8
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 1 to Jul 22
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 29 to Aug 19
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 12 to Sep 2
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 8 to Jul 22
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 15 to Jul 29
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 1 to Jul 15
Sow outdoors: May 2 to May 30Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 9 to May 30Plant for fall: Jul 29 to Aug 19
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 8 to Jul 22
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 9 to Oct 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Rhinelander, 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 | Jul 29 – Aug 26 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 15 – Aug 5 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 17 – Jul 8 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 17 – Jul 8 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 17 – Jul 8 |
| 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 1 – Jul 22 |
| Spinach | — | — | Apr 11 – May 2 | Jul 29 – Aug 19 |
| Radishes | — | — | Apr 18 – May 30 | Aug 12 – Sep 2 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 8 – Jul 22 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 15 – Jul 29 |
| 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 1 – Jul 15 |
| Beets | — | — | May 2 – May 30 | Jul 15 – Jul 29 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 15 – Jul 29 |
| Cilantro | — | — | May 9 – May 30 | Jul 29 – Aug 19 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 8 – Jul 22 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 9 – Oct 14 |
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 Rhinelander 4ne, WI weather station, 8 km away (elevation 1,585 ft (483 m)).
Frost dates near Rhinelander
- Mc Naughton May 26 · Sep 23
- Lake Tomahawk May 19 · Oct 3
- Harshaw May 26 · Sep 23
- Three Lakes May 25 · Sep 24
- Saint Germain May 19 · Oct 3
- Eagle River May 25 · Sep 24
- Pelican Lake Jun 3 · Sep 18
- Hazelhurst May 13 · Oct 3
- Heafford Junction May 10 · Oct 4
- Sayner May 19 · Oct 3
Frequently asked questions
When is the last frost in Rhinelander, WI?
The median last spring frost in Rhinelander, 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 Rhinelander, WI?
The median first fall frost is September 23, with about a 10% chance of frost before September 7.
How long is the growing season in Rhinelander, WI?
About 123 days between the median last spring frost and first fall frost.
What planting zone is Rhinelander, WI?
Rhinelander, WI is in USDA hardiness zone 4b.