Grantville, PA frost dates
Last spring frostMay 1median date
First fall frostOct 16median date
Growing season168 daysfrost-free
Hardiness zone7aZone 7a
How Grantville compares
- In 8 years out of 10, the last spring frost in Grantville falls between April 15 and May 20, a 35-day window. The first fall frost falls between October 3 and November 1.
- The median last frost is 4 days later than the Pennsylvania median of Apr 27.
- Its 168-day growing season is longer than 35% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 15 days later 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 128 nights a year at or below 32°F.
- Compared with Harrisburg, PA, 19 km away, the last frost here is 16 days later than there and the growing season is 23 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 15 |
| 50% (median) | May 1 |
| 10% (safe for tender plants) | May 20 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 3 |
| 50% (median) | October 16 |
| 90% (late) | November 1 |
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 Grantville, PA
Grantville, PA frost dates — last frost May 1, first frost Oct 16, zone 7a. whenisthelastfrost.com
Crop
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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 21 to Sep 18
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 3 to Apr 17Sow outdoors: Apr 3 to Apr 17Plant for fall: Aug 7 to Aug 28
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 10 to Jul 31
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 10 to Apr 24Plant for fall: Jul 10 to Jul 31
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 17 to May 1Plant for fall: Jul 10 to Jul 31
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 24 to Aug 14
Sow outdoors: Mar 20 to Apr 10Plant for fall: Aug 21 to Sep 11
Sow outdoors: Mar 27 to May 8Plant for fall: Sep 4 to Sep 25
Start indoors: Apr 3 to Apr 10Transplant outside: May 15 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jul 31 to Aug 14
Start indoors: Apr 3 to Apr 10Sow outdoors: May 8 to May 22Plant for fall: Aug 7 to Aug 21
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 24 to Aug 7
Sow outdoors: Apr 10 to May 8Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 10 to May 1
Sow outdoors: Apr 17 to May 15Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 17 to May 8Plant for fall: Aug 21 to Sep 11
Sow outdoors: May 8 to May 29Plant for fall: Jul 31 to Aug 14
Sow outdoors: May 8 to May 22
Transplant outside: May 15 to Jun 5
Plant for fall: Oct 2 to Nov 6
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Grantville, PA
| 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 21 – Sep 18 |
| Kale | Mar 6 – Mar 20 | Apr 3 – Apr 17 | Apr 3 – Apr 17 | Aug 7 – Aug 28 |
| Broccoli | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 10 – Jul 31 |
| Cabbage | Mar 6 – Mar 20 | Apr 10 – Apr 24 | — | Jul 10 – Jul 31 |
| Cauliflower | Mar 6 – Mar 20 | Apr 17 – May 1 | — | Jul 10 – Jul 31 |
| 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 24 – Aug 14 |
| Spinach | — | — | Mar 20 – Apr 10 | Aug 21 – Sep 11 |
| Radishes | — | — | Mar 27 – May 8 | Sep 4 – Sep 25 |
| Cucumbers | Apr 3 – Apr 10 | May 15 – May 22 | May 8 – May 22 | Jul 31 – Aug 14 |
| Zucchini & Summer Squash | Apr 3 – Apr 10 | — | May 8 – May 22 | Aug 7 – Aug 21 |
| 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 24 – Aug 7 |
| Beets | — | — | Apr 10 – May 8 | Aug 7 – Aug 21 |
| Potatoes | — | — | Apr 10 – May 1 | — |
| Swiss Chard | — | — | Apr 17 – May 15 | Aug 7 – Aug 21 |
| Cilantro | — | — | Apr 17 – May 8 | Aug 21 – Sep 11 |
| Green Beans | — | — | May 8 – May 29 | Jul 31 – Aug 14 |
| Sweet Corn | — | — | May 8 – May 22 | — |
| Sweet Potatoes | — | May 15 – Jun 5 | — | — |
| Garlic | — | — | — | Oct 2 – Nov 6 |
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 Dehart Dam, PA weather station, 13 km away (elevation 538 ft (164 m)).
Frost dates near Grantville
- Palmyra Apr 20 · Oct 25
- Hummelstown Apr 9 · Nov 2
- Annville Apr 20 · Oct 25
- Hershey Apr 9 · Nov 2
- Campbelltown Apr 20 · Oct 25
- Ono Apr 20 · Oct 25
- Jonestown Apr 20 · Oct 25
- Middletown Apr 9 · Nov 2
- Harrisburg Apr 15 · Oct 23
- Lawn Apr 20 · Oct 25
Frequently asked questions
When is the last frost in Grantville, PA?
The median last spring frost in Grantville, PA is May 1. There is still about a 10% chance of frost after May 20, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Grantville, PA?
The median first fall frost is October 16, with about a 10% chance of frost before October 3.
How long is the growing season in Grantville, PA?
About 168 days between the median last spring frost and first fall frost.
What planting zone is Grantville, PA?
Grantville, PA is in USDA hardiness zone 7a.