Frost dates for Johnstown, 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 29
typical year
Safe to plant
May 17
frost is over in 9 of 10 years
First fall frost
October 21
typical year
Growing season
176 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 1 – 15 | – |
| Spinach | – | Mar 18 – Apr 8 | Aug 26 – Sep 9 |
| Lettuce | – | Apr 1 – 22 | Aug 26 – Sep 9 |
| Radishes | – | Apr 1 – May 13 | Sep 9 – 23 |
| Onions | – | Apr 1 – 15 | – |
| Potatoes | – | Apr 8 – 22 | – |
| Carrots | – | Apr 8 – 29 | Jul 29 – Aug 12 |
| Beets | – | Apr 1 – 15 | Aug 12 – 26 |
| Kale | Feb 18 – Mar 4 | Apr 1 – 15 | Aug 12 – 26 |
| Broccoli | Feb 18 – Mar 4 | Apr 15 – 29 | Aug 12 – 26 |
| Cabbage | Feb 4 – 18 | Apr 1 – 15 | Aug 12 – 26 |
| Garlic | – | – | Sep 9 – 30 |
| Warm-season crops | |||
| Tomatoes | Mar 22 – Apr 5 | May 17 – 31 | – |
| Peppers | Mar 15 – 29 | May 24 – Jun 7 | – |
| Cucumbers | – | May 17 – Jun 7 | – |
| Zucchini | – | May 17 – Jun 14 | – |
| Pumpkins | – | May 17 – Jun 7 | – |
| Green beans | – | May 17 – Aug 12 | – |
| Sweet corn | – | May 17 – Jun 14 | – |
| Basil | Apr 12 – 26 | May 24 – 31 | – |
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 17 | April 29 | April 14 |
| Fall frost before | October 5 | October 21 | November 5 |
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 17 (May 5 in a late year), and the first one in fall around November 2.
Towns that use these dates
This is the nearest NOAA station with frost records for 20 towns.
Johnstown, Westmont, Windber, Geistown, Southmont, Ferndale, East Conemaugh, Dale, South Fork, Paint, Scalp Level, Brownstown, New Florence, Lorain, Summerhill, Seward, Daisytown, Franklin, Ehrenfeld, Benson
Where these dates come from
NOAA weather station JOHNSTOWN CAMBRIA CO AP, PA US (USW00004726), 1991–2020 climate normals. It's the nearest station for 20 zip codes, all within 11 miles:
15901, 15902, 15904, 15905, 15906, 15909, 15921, 15928, 15930, 15934, 15936, 15942, 15945, 15951, 15952, 15953, 15954, 15955, 15956, 15963
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.