Frost dates for Monroeville, 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 22
typical year
Safe to plant
May 12
frost is over in 9 of 10 years
First fall frost
October 25
typical year
Growing season
186 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 25 – Apr 8 | – |
| Spinach | – | Mar 11 – Apr 1 | Aug 30 – Sep 13 |
| Lettuce | – | Mar 25 – Apr 15 | Aug 30 – Sep 13 |
| Radishes | – | Mar 25 – May 6 | Sep 13 – 27 |
| Onions | – | Mar 25 – Apr 8 | – |
| Potatoes | – | Apr 1 – 15 | – |
| Carrots | – | Apr 1 – 22 | Aug 2 – 16 |
| Beets | – | Mar 25 – Apr 8 | Aug 16 – 30 |
| Kale | Feb 11 – 25 | Mar 25 – Apr 8 | Aug 16 – 30 |
| Broccoli | Feb 11 – 25 | Apr 8 – 22 | Aug 16 – 30 |
| Cabbage | Jan 28 – Feb 11 | Mar 25 – Apr 8 | Aug 16 – 30 |
| Garlic | – | – | Sep 13 – Oct 4 |
| Warm-season crops | |||
| Tomatoes | Mar 17 – 31 | May 12 – 26 | – |
| Peppers | Mar 10 – 24 | May 19 – Jun 2 | – |
| Cucumbers | – | May 12 – Jun 2 | – |
| Zucchini | – | May 12 – Jun 9 | – |
| Pumpkins | – | May 12 – Jun 2 | – |
| Green beans | – | May 12 – Aug 16 | – |
| Sweet corn | – | May 12 – Jun 9 | – |
| Basil | Apr 7 – 21 | May 19 – 26 | – |
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 12 | April 22 | April 7 |
| Fall frost before | October 10 | October 25 | November 6 |
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 7 (April 23 in a late year), and the first one in fall around November 5.
Towns that use these dates
This is the nearest NOAA station with frost records for 12 towns.
Monroeville, Murrysville, Jeannette, Irwin, Manor, Trafford, Pitcairn, Export, North Irwin, Penn, Wall, Adamsburg
Where these dates come from
NOAA weather station MURRYSVILLE 2 SW, PA US (USC00366111), 1991–2020 climate normals. It's the nearest station for 18 zip codes, all within 10 miles:
15085, 15140, 15146, 15239, 15611, 15615, 15623, 15625, 15634, 15636, 15642, 15644, 15647, 15665, 15668, 15675, 15691, 15692
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.