Windsor, PA frost dates
Last spring frostApr 1median date
First fall frostNov 10median date
Growing season223 daysfrost-free
Hardiness zone7aZone 7a
How Windsor compares
- In 8 years out of 10, the last spring frost in Windsor falls between March 18 and April 13, a 26-day window. The first fall frost falls between October 28 and November 25.
- The median last frost is 26 days earlier than the Pennsylvania median of Apr 27.
- Its 223-day growing season is among the longest of the 1,787 Pennsylvania places with a regular frost season.
- The last frost is 15 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 87 nights a year at or below 32°F.
- Compared with Lancaster, PA, 25 km away, the last frost here is 18 days earlier than there and the growing season is 35 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 18 |
| 50% (median) | April 1 |
| 10% (safe for tender plants) | April 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 28 |
| 50% (median) | November 10 |
| 90% (late) | November 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 Windsor, PA
Windsor, PA frost dates — last frost Apr 1, first frost Nov 10, zone 7a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Jan 7 to Jan 21Transplant outside: Mar 4 to Mar 18
Start indoors: Jan 21 to Feb 4Transplant outside: Apr 15 to Apr 29
Start indoors: Jan 21 to Feb 4Transplant outside: Apr 15 to Apr 29
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 11 to Mar 25Sow outdoors: Mar 4 to Apr 8Plant for fall: Sep 15 to Oct 13
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 4 to Mar 18Sow outdoors: Mar 4 to Mar 18Plant for fall: Sep 1 to Sep 22
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 18 to Apr 1Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 11 to Mar 25Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 4 to Feb 18Transplant outside: Mar 18 to Apr 1Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 22 to May 6Sow outdoors: Apr 22 to May 6
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 8 to Apr 22
Sow outdoors: Feb 18 to Mar 11Plant for fall: Aug 18 to Sep 8
Sow outdoors: Feb 18 to Mar 11Plant for fall: Sep 15 to Oct 6
Sow outdoors: Feb 25 to Apr 8Plant for fall: Sep 29 to Oct 20
Start indoors: Mar 4 to Mar 11Transplant outside: Apr 15 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Aug 25 to Sep 8
Start indoors: Mar 4 to Mar 11Sow outdoors: Apr 8 to Apr 22Plant for fall: Sep 1 to Sep 15
Start indoors: Mar 4 to Mar 11Sow outdoors: Apr 8 to Apr 22
Start indoors: Mar 4 to Mar 11Transplant outside: Apr 15 to Apr 29
Sow outdoors: Mar 11 to Apr 8Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 11 to Apr 8Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 11 to Apr 1
Sow outdoors: Mar 18 to Apr 15Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 18 to Apr 8Plant for fall: Sep 15 to Oct 6
Sow outdoors: Apr 8 to Apr 29Plant for fall: Aug 25 to Sep 8
Sow outdoors: Apr 8 to Apr 22
Transplant outside: Apr 15 to May 6
Plant for fall: Oct 27 to Dec 1
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Windsor, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 7 – Jan 21 | Mar 4 – Mar 18 | — | — |
| Peppers | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Eggplant | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Tomatoes | Feb 4 – Feb 18 | Apr 8 – Apr 22 | — | — |
| Lettuce | Feb 4 – Feb 18 | Mar 11 – Mar 25 | Mar 4 – Apr 8 | Sep 15 – Oct 13 |
| Kale | Feb 4 – Feb 18 | Mar 4 – Mar 18 | Mar 4 – Mar 18 | Sep 1 – Sep 22 |
| Broccoli | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Aug 4 – Aug 25 |
| Cabbage | Feb 4 – Feb 18 | Mar 11 – Mar 25 | — | Aug 4 – Aug 25 |
| Cauliflower | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Aug 4 – Aug 25 |
| Okra | Feb 18 – Mar 4 | Apr 22 – May 6 | Apr 22 – May 6 | — |
| Basil | Feb 18 – Mar 4 | Apr 8 – Apr 22 | — | — |
| Peas | — | — | Feb 18 – Mar 11 | Aug 18 – Sep 8 |
| Spinach | — | — | Feb 18 – Mar 11 | Sep 15 – Oct 6 |
| Radishes | — | — | Feb 25 – Apr 8 | Sep 29 – Oct 20 |
| Cucumbers | Mar 4 – Mar 11 | Apr 15 – Apr 22 | Apr 8 – Apr 22 | Aug 25 – Sep 8 |
| Zucchini & Summer Squash | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | Sep 1 – Sep 15 |
| Winter Squash & Pumpkins | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | — |
| Melons & Watermelon | Mar 4 – Mar 11 | Apr 15 – Apr 29 | — | — |
| Carrots | — | — | Mar 11 – Apr 8 | Aug 18 – Sep 1 |
| Beets | — | — | Mar 11 – Apr 8 | Sep 1 – Sep 15 |
| Potatoes | — | — | Mar 11 – Apr 1 | — |
| Swiss Chard | — | — | Mar 18 – Apr 15 | Sep 1 – Sep 15 |
| Cilantro | — | — | Mar 18 – Apr 8 | Sep 15 – Oct 6 |
| Green Beans | — | — | Apr 8 – Apr 29 | Aug 25 – Sep 8 |
| Sweet Corn | — | — | Apr 8 – Apr 22 | — |
| Sweet Potatoes | — | Apr 15 – May 6 | — | — |
| Garlic | — | — | — | Oct 27 – Dec 1 |
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 Safe Harbor Dam, PA weather station, 14 km away (elevation 194 ft (59 m)).
Frost dates near Windsor
- Red Lion Apr 26 · Oct 19
- Craley Apr 1 · Nov 10
- East Prospect Apr 1 · Nov 10
- Dallastown Apr 26 · Oct 19
- Wrightsville Apr 1 · Nov 10
- Felton Apr 26 · Oct 19
- Brogue Apr 1 · Nov 10
- Rossville Apr 26 · Oct 19
- Washington Boro Apr 1 · Nov 10
- York Apr 26 · Oct 19
Frequently asked questions
When is the last frost in Windsor, PA?
The median last spring frost in Windsor, PA is April 1. There is still about a 10% chance of frost after April 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Windsor, PA?
The median first fall frost is November 10, with about a 10% chance of frost before October 28.
How long is the growing season in Windsor, PA?
About 223 days between the median last spring frost and first fall frost.
What planting zone is Windsor, PA?
Windsor, PA is in USDA hardiness zone 7a.