Clairton, PA frost dates
Last spring frostApr 18median date
First fall frostOct 28median date
Growing season193 daysfrost-free
Hardiness zone6bZone 6b
How Clairton compares
- In 8 years out of 10, the last spring frost in Clairton falls between April 2 and May 6, a 34-day window. The first fall frost falls between October 14 and November 10.
- The median last frost is 9 days earlier than the Pennsylvania median of Apr 27.
- Its 193-day growing season is longer than 86% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is 4 days earlier 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 106 nights a year at or below 32°F.
- Compared with Pittsburgh, PA, 14 km away, the last frost here is 6 days earlier than there and the growing season is 7 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 2 |
| 50% (median) | April 18 |
| 10% (safe for tender plants) | May 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 14 |
| 50% (median) | October 28 |
| 90% (late) | November 10 |
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 Clairton, PA
Clairton, PA frost dates — last frost Apr 18, first frost Oct 28, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Jan 24 to Feb 7Transplant outside: Mar 21 to Apr 4
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 7 to Feb 21Transplant outside: May 2 to May 16
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 25 to May 9
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 21 to Apr 25Plant for fall: Sep 2 to Sep 30
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 21 to Apr 4Sow outdoors: Mar 21 to Apr 4Plant for fall: Aug 19 to Sep 9
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 22 to Aug 12
Start indoors: Feb 21 to Mar 7Transplant outside: Mar 28 to Apr 11Plant for fall: Jul 22 to Aug 12
Start indoors: Feb 21 to Mar 7Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 22 to Aug 12
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23Sow outdoors: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 25 to May 9
Sow outdoors: Mar 7 to Mar 28Plant for fall: Aug 5 to Aug 26
Sow outdoors: Mar 7 to Mar 28Plant for fall: Sep 2 to Sep 23
Sow outdoors: Mar 14 to Apr 25Plant for fall: Sep 16 to Oct 7
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Aug 12 to Aug 26
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9Plant for fall: Aug 19 to Sep 2
Start indoors: Mar 21 to Mar 28Sow outdoors: Apr 25 to May 9
Start indoors: Mar 21 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 5 to Aug 19
Sow outdoors: Mar 28 to Apr 25Plant for fall: Aug 19 to Sep 2
Sow outdoors: Mar 28 to Apr 18
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 19 to Sep 2
Sow outdoors: Apr 4 to Apr 25Plant for fall: Sep 2 to Sep 23
Sow outdoors: Apr 25 to May 16Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 25 to May 9
Transplant outside: May 2 to May 23
Plant for fall: Oct 14 to Nov 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Clairton, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 24 – Feb 7 | Mar 21 – Apr 4 | — | — |
| Peppers | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Eggplant | Feb 7 – Feb 21 | May 2 – May 16 | — | — |
| Tomatoes | Feb 21 – Mar 7 | Apr 25 – May 9 | — | — |
| Lettuce | Feb 21 – Mar 7 | Mar 28 – Apr 11 | Mar 21 – Apr 25 | Sep 2 – Sep 30 |
| Kale | Feb 21 – Mar 7 | Mar 21 – Apr 4 | Mar 21 – Apr 4 | Aug 19 – Sep 9 |
| Broccoli | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 22 – Aug 12 |
| Cabbage | Feb 21 – Mar 7 | Mar 28 – Apr 11 | — | Jul 22 – Aug 12 |
| Cauliflower | Feb 21 – Mar 7 | Apr 4 – Apr 18 | — | Jul 22 – Aug 12 |
| Okra | Mar 7 – Mar 21 | May 9 – May 23 | May 9 – May 23 | — |
| Basil | Mar 7 – Mar 21 | Apr 25 – May 9 | — | — |
| Peas | — | — | Mar 7 – Mar 28 | Aug 5 – Aug 26 |
| Spinach | — | — | Mar 7 – Mar 28 | Sep 2 – Sep 23 |
| Radishes | — | — | Mar 14 – Apr 25 | Sep 16 – Oct 7 |
| Cucumbers | Mar 21 – Mar 28 | May 2 – May 9 | Apr 25 – May 9 | Aug 12 – Aug 26 |
| Zucchini & Summer Squash | Mar 21 – Mar 28 | — | Apr 25 – May 9 | Aug 19 – Sep 2 |
| Winter Squash & Pumpkins | Mar 21 – Mar 28 | — | Apr 25 – May 9 | — |
| Melons & Watermelon | Mar 21 – Mar 28 | May 2 – May 16 | — | — |
| Carrots | — | — | Mar 28 – Apr 25 | Aug 5 – Aug 19 |
| Beets | — | — | Mar 28 – Apr 25 | Aug 19 – Sep 2 |
| Potatoes | — | — | Mar 28 – Apr 18 | — |
| Swiss Chard | — | — | Apr 4 – May 2 | Aug 19 – Sep 2 |
| Cilantro | — | — | Apr 4 – Apr 25 | Sep 2 – Sep 23 |
| Green Beans | — | — | Apr 25 – May 16 | Aug 12 – Aug 26 |
| Sweet Corn | — | — | Apr 25 – May 9 | — |
| Sweet Potatoes | — | May 2 – May 23 | — | — |
| Garlic | — | — | — | Oct 14 – Nov 18 |
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 Pittsburgh Allegheny Co Ap, PA weather station, 4 km away (elevation 1,247 ft (380 m)).
Frost dates near Clairton
- Glassport May 2 · Oct 20
- Dravosburg Apr 18 · Oct 28
- Mckeesport May 2 · Oct 20
- South Park Apr 18 · Oct 28
- West Elizabeth May 2 · Oct 20
- Homestead Apr 5 · Nov 10
- Elrama Apr 27 · Oct 22
- Finleyville Apr 18 · Oct 28
- West Mifflin Apr 18 · Oct 28
- Duquesne Apr 5 · Nov 10
Frequently asked questions
When is the last frost in Clairton, PA?
The median last spring frost in Clairton, PA is April 18. There is still about a 10% chance of frost after May 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Clairton, PA?
The median first fall frost is October 28, with about a 10% chance of frost before October 14.
How long is the growing season in Clairton, PA?
About 193 days between the median last spring frost and first fall frost.
What planting zone is Clairton, PA?
Clairton, PA is in USDA hardiness zone 6b.