Frost dates for 54901 — Oshkosh, WI
Last spring frostApr 24median date
First fall frostOct 20median date
Growing season179 daysfrost-free
Hardiness zone5bZone 5b
How Oshkosh compares
- In 8 years out of 10, the last spring frost in Oshkosh falls between April 10 and May 8, a 28-day window. The first fall frost falls between October 4 and November 2.
- The median last frost is 11 days earlier than the Wisconsin median of May 5.
- Its 179-day growing season is longer than 93% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is 7 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 143 nights a year at or below 32°F.
- Compared with Appleton, WI, 35 km away, the last frost here is 10 days earlier than there and the growing season is 24 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 10 |
| 50% (median) | April 24 |
| 10% (safe for tender plants) | May 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 4 |
| 50% (median) | October 20 |
| 90% (late) | November 2 |
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 Oshkosh, WI
Frost dates for 54901 — Oshkosh, WI — last frost Apr 24, first frost Oct 20, zone 5b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Jan 30 to Feb 13Transplant outside: Mar 27 to Apr 10
Start indoors: Feb 13 to Feb 27Transplant outside: May 8 to May 22
Start indoors: Feb 13 to Feb 27Transplant outside: May 8 to May 22
Start indoors: Feb 27 to Mar 13Transplant outside: May 1 to May 15
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 3 to Apr 17Sow outdoors: Mar 27 to May 1Plant for fall: Aug 25 to Sep 22
Start indoors: Feb 27 to Mar 13Transplant outside: Mar 27 to Apr 10Sow outdoors: Mar 27 to Apr 10Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 3 to Apr 17Plant for fall: Jul 14 to Aug 4
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 13 to Mar 27Transplant outside: May 15 to May 29Sow outdoors: May 15 to May 29
Start indoors: Mar 13 to Mar 27Transplant outside: May 1 to May 15
Sow outdoors: Mar 13 to Apr 3Plant for fall: Jul 28 to Aug 18
Sow outdoors: Mar 13 to Apr 3Plant for fall: Aug 25 to Sep 15
Sow outdoors: Mar 20 to May 1Plant for fall: Sep 8 to Sep 29
Start indoors: Mar 27 to Apr 3Transplant outside: May 8 to May 15Sow outdoors: May 1 to May 15Plant for fall: Aug 4 to Aug 18
Start indoors: Mar 27 to Apr 3Sow outdoors: May 1 to May 15Plant for fall: Aug 11 to Aug 25
Start indoors: Mar 27 to Apr 3Sow outdoors: May 1 to May 15
Start indoors: Mar 27 to Apr 3Transplant outside: May 8 to May 22
Sow outdoors: Apr 3 to May 1Plant for fall: Jul 28 to Aug 11
Sow outdoors: Apr 3 to May 1Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 3 to Apr 24
Sow outdoors: Apr 10 to May 8Plant for fall: Aug 11 to Aug 25
Sow outdoors: Apr 10 to May 1Plant for fall: Aug 25 to Sep 15
Sow outdoors: May 1 to May 22Plant for fall: Aug 4 to Aug 18
Sow outdoors: May 1 to May 15
Transplant outside: May 8 to May 29
Plant for fall: Oct 6 to Nov 10
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Oshkosh, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 30 – Feb 13 | Mar 27 – Apr 10 | — | — |
| Peppers | Feb 13 – Feb 27 | May 8 – May 22 | — | — |
| Eggplant | Feb 13 – Feb 27 | May 8 – May 22 | — | — |
| Tomatoes | Feb 27 – Mar 13 | May 1 – May 15 | — | — |
| Lettuce | Feb 27 – Mar 13 | Apr 3 – Apr 17 | Mar 27 – May 1 | Aug 25 – Sep 22 |
| Kale | Feb 27 – Mar 13 | Mar 27 – Apr 10 | Mar 27 – Apr 10 | Aug 11 – Sep 1 |
| Broccoli | Feb 27 – Mar 13 | Apr 10 – Apr 24 | — | Jul 14 – Aug 4 |
| Cabbage | Feb 27 – Mar 13 | Apr 3 – Apr 17 | — | Jul 14 – Aug 4 |
| Cauliflower | Feb 27 – Mar 13 | Apr 10 – Apr 24 | — | Jul 14 – Aug 4 |
| Okra | Mar 13 – Mar 27 | May 15 – May 29 | May 15 – May 29 | — |
| Basil | Mar 13 – Mar 27 | May 1 – May 15 | — | — |
| Peas | — | — | Mar 13 – Apr 3 | Jul 28 – Aug 18 |
| Spinach | — | — | Mar 13 – Apr 3 | Aug 25 – Sep 15 |
| Radishes | — | — | Mar 20 – May 1 | Sep 8 – Sep 29 |
| Cucumbers | Mar 27 – Apr 3 | May 8 – May 15 | May 1 – May 15 | Aug 4 – Aug 18 |
| Zucchini & Summer Squash | Mar 27 – Apr 3 | — | May 1 – May 15 | Aug 11 – Aug 25 |
| Winter Squash & Pumpkins | Mar 27 – Apr 3 | — | May 1 – May 15 | — |
| Melons & Watermelon | Mar 27 – Apr 3 | May 8 – May 22 | — | — |
| Carrots | — | — | Apr 3 – May 1 | Jul 28 – Aug 11 |
| Beets | — | — | Apr 3 – May 1 | Aug 11 – Aug 25 |
| Potatoes | — | — | Apr 3 – Apr 24 | — |
| Swiss Chard | — | — | Apr 10 – May 8 | Aug 11 – Aug 25 |
| Cilantro | — | — | Apr 10 – May 1 | Aug 25 – Sep 15 |
| Green Beans | — | — | May 1 – May 22 | Aug 4 – Aug 18 |
| Sweet Corn | — | — | May 1 – May 15 | — |
| Sweet Potatoes | — | May 8 – May 29 | — | — |
| Garlic | — | — | — | Oct 6 – Nov 10 |
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 Oshkosh, WI weather station, about 1 km away (elevation 751 ft (229 m)).
ZIP codes in Oshkosh: 54901 54902 54903 54904 54906
Frost dates near Oshkosh
- Winnebago Apr 24 · Oct 20
- Butte Des Morts Apr 24 · Oct 20
- Omro Apr 24 · Oct 20
- Van Dyne May 1 · Oct 12
- Winneconne Apr 24 · Oct 20
- Waukau May 1 · Oct 11
- Neenah May 4 · Oct 6
- Pickett May 1 · Oct 11
Frequently asked questions
When is the last frost in Oshkosh, WI?
The median last spring frost in Oshkosh, WI is April 24. 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 Oshkosh, WI?
The median first fall frost is October 20, with about a 10% chance of frost before October 4.
How long is the growing season in Oshkosh, WI?
About 179 days between the median last spring frost and first fall frost.
What planting zone is Oshkosh, WI?
Oshkosh, WI is in USDA hardiness zone 5b.