Frost dates for Butler, 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
May 7
typical year
Safe to plant
May 23
frost is over in 9 of 10 years
First fall frost
October 14
typical year
Growing season
159 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 | – | Apr 9 – 23 | – |
| Spinach | – | Mar 26 – Apr 16 | Aug 19 – Sep 2 |
| Lettuce | – | Apr 9 – 30 | Aug 19 – Sep 2 |
| Radishes | – | Apr 9 – May 21 | Sep 2 – 16 |
| Onions | – | Apr 9 – 23 | – |
| Potatoes | – | Apr 16 – 30 | – |
| Carrots | – | Apr 16 – May 7 | Jul 22 – Aug 5 |
| Beets | – | Apr 9 – 23 | Aug 5 – 19 |
| Kale | Feb 26 – Mar 12 | Apr 9 – 23 | Aug 5 – 19 |
| Broccoli | Feb 26 – Mar 12 | Apr 23 – May 7 | Aug 5 – 19 |
| Cabbage | Feb 12 – 26 | Apr 9 – 23 | Aug 5 – 19 |
| Garlic | – | – | Sep 2 – 23 |
| Warm-season crops | |||
| Tomatoes | Mar 28 – Apr 11 | May 23 – Jun 6 | – |
| Peppers | Mar 21 – Apr 4 | May 30 – Jun 13 | – |
| Cucumbers | – | May 23 – Jun 13 | – |
| Zucchini | – | May 23 – Jun 20 | – |
| Pumpkins | – | May 23 – Jun 13 | – |
| Green beans | – | May 23 – Aug 5 | – |
| Sweet corn | – | May 23 – Jun 20 | – |
| Basil | Apr 18 – May 2 | May 30 – Jun 6 | – |
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 23 | May 7 | April 22 |
| Fall frost before | October 1 | October 14 | October 30 |
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 26 (May 14 in a late year), and the first one in fall around October 27.
Towns that use these dates
This is the nearest NOAA station with frost records for 13 towns.
Butler, Evans City, Mars, Saxonburg, Prospect, Chicora, Connoquenessing, East Butler, Valencia, Callery, Fairview, Petrolia, Karns City
Where these dates come from
NOAA weather station BUTLER 2 SW, PA US (USC00361139), 1991–2020 climate normals. It's the nearest station for 16 zip codes, all within 17 miles:
16001, 16002, 16024, 16025, 16027, 16028, 16029, 16033, 16034, 16041, 16045, 16046, 16052, 16053, 16056, 16059
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.