Smithton, PA frost dates
Last spring frostApr 27median date
First fall frostOct 22median date
Growing season178 daysfrost-free
Hardiness zone6bZone 6b
How Smithton compares
- In 8 years out of 10, the last spring frost in Smithton falls between April 11 and May 15, a 34-day window. The first fall frost falls between October 8 and November 4.
- The median last frost is the same as the Pennsylvania median of Apr 27.
- Its 178-day growing season is longer than 58% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 5 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 116 nights a year at or below 32°F.
- Compared with Pittsburgh, PA, 39 km away, the last frost here is 3 days later than there and the growing season is 8 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 11 |
| 50% (median) | April 27 |
| 10% (safe for tender plants) | May 15 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 8 |
| 50% (median) | October 22 |
| 90% (late) | November 4 |
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 Smithton, PA
Smithton, PA frost dates — last frost Apr 27, first frost Oct 22, zone 6b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 2 to Feb 16Transplant outside: Mar 30 to Apr 13
Start indoors: Feb 16 to Mar 2Transplant outside: May 11 to May 25
Start indoors: Feb 16 to Mar 2Transplant outside: May 11 to May 25
Start indoors: Mar 2 to Mar 16Transplant outside: May 4 to May 18
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 6 to Apr 20Sow outdoors: Mar 30 to May 4Plant for fall: Aug 27 to Sep 24
Start indoors: Mar 2 to Mar 16Transplant outside: Mar 30 to Apr 13Sow outdoors: Mar 30 to Apr 13Plant for fall: Aug 13 to Sep 3
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 13 to Apr 27Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 6 to Apr 20Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 13 to Apr 27Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 16 to Mar 30Transplant outside: May 18 to Jun 1Sow outdoors: May 18 to Jun 1
Start indoors: Mar 16 to Mar 30Transplant outside: May 4 to May 18
Sow outdoors: Mar 16 to Apr 6Plant for fall: Jul 30 to Aug 20
Sow outdoors: Mar 16 to Apr 6Plant for fall: Aug 27 to Sep 17
Sow outdoors: Mar 23 to May 4Plant for fall: Sep 10 to Oct 1
Start indoors: Mar 30 to Apr 6Transplant outside: May 11 to May 18Sow outdoors: May 4 to May 18Plant for fall: Aug 6 to Aug 20
Start indoors: Mar 30 to Apr 6Sow outdoors: May 4 to May 18Plant for fall: Aug 13 to Aug 27
Start indoors: Mar 30 to Apr 6Sow outdoors: May 4 to May 18
Start indoors: Mar 30 to Apr 6Transplant outside: May 11 to May 25
Sow outdoors: Apr 6 to May 4Plant for fall: Jul 30 to Aug 13
Sow outdoors: Apr 6 to May 4Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 6 to Apr 27
Sow outdoors: Apr 13 to May 11Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 13 to May 4Plant for fall: Aug 27 to Sep 17
Sow outdoors: May 4 to May 25Plant for fall: Aug 6 to Aug 20
Sow outdoors: May 4 to May 18
Transplant outside: May 11 to Jun 1
Plant for fall: Oct 8 to Nov 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Smithton, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 2 – Feb 16 | Mar 30 – Apr 13 | — | — |
| Peppers | Feb 16 – Mar 2 | May 11 – May 25 | — | — |
| Eggplant | Feb 16 – Mar 2 | May 11 – May 25 | — | — |
| Tomatoes | Mar 2 – Mar 16 | May 4 – May 18 | — | — |
| Lettuce | Mar 2 – Mar 16 | Apr 6 – Apr 20 | Mar 30 – May 4 | Aug 27 – Sep 24 |
| Kale | Mar 2 – Mar 16 | Mar 30 – Apr 13 | Mar 30 – Apr 13 | Aug 13 – Sep 3 |
| Broccoli | Mar 2 – Mar 16 | Apr 13 – Apr 27 | — | Jul 16 – Aug 6 |
| Cabbage | Mar 2 – Mar 16 | Apr 6 – Apr 20 | — | Jul 16 – Aug 6 |
| Cauliflower | Mar 2 – Mar 16 | Apr 13 – Apr 27 | — | Jul 16 – Aug 6 |
| Okra | Mar 16 – Mar 30 | May 18 – Jun 1 | May 18 – Jun 1 | — |
| Basil | Mar 16 – Mar 30 | May 4 – May 18 | — | — |
| Peas | — | — | Mar 16 – Apr 6 | Jul 30 – Aug 20 |
| Spinach | — | — | Mar 16 – Apr 6 | Aug 27 – Sep 17 |
| Radishes | — | — | Mar 23 – May 4 | Sep 10 – Oct 1 |
| Cucumbers | Mar 30 – Apr 6 | May 11 – May 18 | May 4 – May 18 | Aug 6 – Aug 20 |
| Zucchini & Summer Squash | Mar 30 – Apr 6 | — | May 4 – May 18 | Aug 13 – Aug 27 |
| Winter Squash & Pumpkins | Mar 30 – Apr 6 | — | May 4 – May 18 | — |
| Melons & Watermelon | Mar 30 – Apr 6 | May 11 – May 25 | — | — |
| Carrots | — | — | Apr 6 – May 4 | Jul 30 – Aug 13 |
| Beets | — | — | Apr 6 – May 4 | Aug 13 – Aug 27 |
| Potatoes | — | — | Apr 6 – Apr 27 | — |
| Swiss Chard | — | — | Apr 13 – May 11 | Aug 13 – Aug 27 |
| Cilantro | — | — | Apr 13 – May 4 | Aug 27 – Sep 17 |
| Green Beans | — | — | May 4 – May 25 | Aug 6 – Aug 20 |
| Sweet Corn | — | — | May 4 – May 18 | — |
| Sweet Potatoes | — | May 11 – Jun 1 | — | — |
| Garlic | — | — | — | Oct 8 – Nov 12 |
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 Donora 1 Sw, PA weather station, 11 km away (elevation 761 ft (232 m)).
Frost dates near Smithton
- Jacobs Creek Apr 27 · Oct 22
- Wickhaven Apr 27 · Oct 22
- Wyano Apr 27 · Oct 22
- West Newton Apr 27 · Oct 22
- Belle Vernon Apr 27 · Oct 22
- Hutchinson Apr 27 · Oct 22
- Yukon May 1 · Oct 13
- Ruffs Dale May 1 · Oct 13
- Webster Apr 27 · Oct 22
- Herminie Apr 27 · Oct 22
Frequently asked questions
When is the last frost in Smithton, PA?
The median last spring frost in Smithton, PA is April 27. There is still about a 10% chance of frost after May 15, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Smithton, PA?
The median first fall frost is October 22, with about a 10% chance of frost before October 8.
How long is the growing season in Smithton, PA?
About 178 days between the median last spring frost and first fall frost.
What planting zone is Smithton, PA?
Smithton, PA is in USDA hardiness zone 6b.