Frost dates for Pittsburgh, PA
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
April 18
typical year
Safe to plant
May 6
frost is over in 9 of 10 years
First fall frost
October 28
typical year
Growing season
193 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 21 – Apr 4 | – |
| Spinach | – | Mar 7 – 28 | Sep 2 – 16 |
| Lettuce | – | Mar 21 – Apr 11 | Sep 2 – 16 |
| Radishes | – | Mar 21 – May 2 | Sep 16 – 30 |
| Onions | – | Mar 21 – Apr 4 | – |
| Potatoes | – | Mar 28 – Apr 11 | – |
| Carrots | – | Mar 28 – Apr 18 | Aug 5 – 19 |
| Beets | – | Mar 21 – Apr 4 | Aug 19 – Sep 2 |
| Kale | Feb 7 – 21 | Mar 21 – Apr 4 | Aug 19 – Sep 2 |
| Broccoli | Feb 7 – 21 | Apr 4 – 18 | Aug 19 – Sep 2 |
| Cabbage | Jan 24 – Feb 7 | Mar 21 – Apr 4 | Aug 19 – Sep 2 |
| Garlic | – | – | Sep 16 – Oct 7 |
| Warm-season crops | |||
| Tomatoes | Mar 11 – 25 | May 6 – 20 | – |
| Peppers | Mar 4 – 18 | May 13 – 27 | – |
| Cucumbers | – | May 6 – 27 | – |
| Zucchini | – | May 6 – Jun 3 | – |
| Pumpkins | – | May 6 – 27 | – |
| Green beans | – | May 6 – Aug 19 | – |
| Sweet corn | – | May 6 – Jun 3 | – |
| Basil | Apr 1 – 15 | May 13 – 20 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | May 6 | April 18 | April 2 |
| Fall frost before | October 14 | October 28 | November 10 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around April 5 (April 21 in a late year), and the first one in fall around November 8.
Towns that use these dates
This is the nearest NOAA station with frost records for 15 towns.
Pittsburgh, Mount Lebanon, Bethel Park, Baldwin, West Mifflin, Whitehall, Jefferson Hills, Brentwood, Pleasant Hills, Castle Shannon, Dormont, Bridgeville, Mount Oliver, Dravosburg, Finleyville
Where these dates come from
NOAA weather station PITTSBURGH ALLEGHENY CO AP, PA US (USW00014762), 1991–2020 climate normals. It's the nearest station for 20 zip codes, all within 9 miles:
15025, 15034, 15102, 15122, 15123, 15129, 15203, 15207, 15210, 15213, 15216, 15219, 15226, 15227, 15228, 15234, 15236, 15241, 15243, 15282
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.