Frost dates for 53146 — New Berlin, WI
Last spring frostMay 1median date
First fall frostOct 13median date
Growing season165 daysfrost-free
Hardiness zone5bZone 5b
How New Berlin compares
- In 8 years out of 10, the last spring frost in New Berlin falls between April 18 and May 18, a 30-day window. The first fall frost falls between September 29 and October 25.
- The median last frost is 4 days earlier than the Wisconsin median of May 5.
- Its 165-day growing season is longer than 75% of the 749 Wisconsin places with a regular frost season (state median 155 days).
- The last frost is typical for zone 5b, where the median is May 1.
- The weather station records an average of 143 nights a year at or below 32°F.
- New Berlin shares its weather station with Waukesha, WI, 8 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 18 |
| 50% (median) | May 1 |
| 10% (safe for tender plants) | May 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 29 |
| 50% (median) | October 13 |
| 90% (late) | October 25 |
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 New Berlin, WI
Frost dates for 53146 — New Berlin, WI — last frost May 1, first frost Oct 13, zone 5b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 6 to Feb 20Transplant outside: Apr 3 to Apr 17
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Feb 20 to Mar 6Transplant outside: May 15 to May 29
Start indoors: Mar 6 to Mar 20Transplant outside: May 8 to May 22
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Sow outdoors: Apr 3 to May 8Plant for fall: Aug 18 to Sep 15
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 3 to Apr 17Sow outdoors: Apr 3 to Apr 17Plant for fall: Aug 4 to Aug 25
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 20 to Apr 3Transplant outside: May 22 to Jun 5Sow outdoors: May 22 to Jun 5
Start indoors: Mar 20 to Apr 3Transplant outside: May 8 to May 22
Sow outdoors: Mar 20 to Apr 10Plant for fall: Jul 21 to Aug 11
Sow outdoors: Mar 20 to Apr 10Plant for fall: Aug 18 to Sep 8
Sow outdoors: Mar 27 to May 8Plant for fall: Sep 1 to Sep 22
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22Plant for fall: Aug 4 to Aug 18
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 29
Sow outdoors: Apr 10 to May 8Plant for fall: Jul 21 to Aug 4
Sow outdoors: Apr 10 to May 8Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 10 to May 1
Sow outdoors: Apr 17 to May 15Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 17 to May 8Plant for fall: Aug 18 to Sep 8
Sow outdoors: May 8 to May 29Plant for fall: Jul 28 to Aug 11
Sow outdoors: May 8 to May 22
Transplant outside: May 15 to Jun 5
Plant for fall: Sep 29 to Nov 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in New Berlin, WI
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 6 – Feb 20 | Apr 3 – Apr 17 | — | — |
| Peppers | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Eggplant | Feb 20 – Mar 6 | May 15 – May 29 | — | — |
| Tomatoes | Mar 6 – Mar 20 | May 8 – May 22 | — | — |
| Lettuce | Mar 6 – Mar 20 | Apr 10 – Apr 24 | Apr 3 – May 8 | Aug 18 – Sep 15 |
| Kale | Mar 6 – Mar 20 | Apr 3 – Apr 17 | Apr 3 – Apr 17 | Aug 4 – Aug 25 |
| Broccoli | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 7 – Jul 28 |
| Cabbage | Mar 6 – Mar 20 | Apr 10 – Apr 24 | — | Jul 7 – Jul 28 |
| Cauliflower | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 7 – Jul 28 |
| Okra | Mar 20 – Apr 3 | May 22 – Jun 5 | May 22 – Jun 5 | — |
| Basil | Mar 20 – Apr 3 | May 8 – May 22 | — | — |
| Peas | — | — | Mar 20 – Apr 10 | Jul 21 – Aug 11 |
| Spinach | — | — | Mar 20 – Apr 10 | Aug 18 – Sep 8 |
| Radishes | — | — | Mar 27 – May 8 | Sep 1 – Sep 22 |
| Cucumbers | Apr 3 – Apr 10 | May 15 – May 22 | May 8 – May 22 | Jul 28 – Aug 11 |
| Zucchini & Summer Squash | Apr 3 – Apr 10 | — | May 8 – May 22 | Aug 4 – Aug 18 |
| Winter Squash & Pumpkins | Apr 3 – Apr 10 | — | May 8 – May 22 | — |
| Melons & Watermelon | Apr 3 – Apr 10 | May 15 – May 29 | — | — |
| Carrots | — | — | Apr 10 – May 8 | Jul 21 – Aug 4 |
| Beets | — | — | Apr 10 – May 8 | Aug 4 – Aug 18 |
| Potatoes | — | — | Apr 10 – May 1 | — |
| Swiss Chard | — | — | Apr 17 – May 15 | Aug 4 – Aug 18 |
| Cilantro | — | — | Apr 17 – May 8 | Aug 18 – Sep 8 |
| Green Beans | — | — | May 8 – May 29 | Jul 28 – Aug 11 |
| Sweet Corn | — | — | May 8 – May 22 | — |
| Sweet Potatoes | — | May 15 – Jun 5 | — | — |
| Garlic | — | — | — | Sep 29 – Nov 3 |
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 Waukesha Wwtp, WI weather station, 8 km away (elevation 791 ft (241 m)).
ZIP codes in New Berlin: 53146 53151
Frost dates near New Berlin
- Muskego May 3 · Oct 14
- Waukesha May 1 · Oct 13
- Hales Corners May 3 · Oct 14
- Elm Grove Apr 26 · Oct 18
- Brookfield Apr 30 · Oct 14
- Big Bend May 1 · Oct 13
- Greendale May 3 · Oct 14
- Franklin May 3 · Oct 14
Frequently asked questions
When is the last frost in New Berlin, WI?
The median last spring frost in New Berlin, WI is May 1. There is still about a 10% chance of frost after May 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in New Berlin, WI?
The median first fall frost is October 13, with about a 10% chance of frost before September 29.
How long is the growing season in New Berlin, WI?
About 165 days between the median last spring frost and first fall frost.
What planting zone is New Berlin, WI?
New Berlin, WI is in USDA hardiness zone 5b.