USDA Hardiness Zone 6a
Frost Dates for 16407 — Corry, Pennsylvania
NOAA 1991–2020 normals from Union City Filtration Plant, PA (1,400 ft), 11 miles west.
Updated
In Corry, the last spring frost (32°F) is around May 7 in half of years and has passed by May 24 in nine years out of ten. The first fall frost comes around October 10, as early as September 29 one year in ten, leaving a typical freeze-free season of 155 days (NOAA, Union City Filtration Plant, PA).
- Last spring frost
- May 7
- First fall frost
- October 10
- Growing season
- 155 days
- Hardiness zone
- 6a
50% probability
50% probability
freeze-free, 50%
-10 to -5°F (-23.3 to -20.6°C) coldest night
- First snow
- November 8
- Last snow
- April 8
- Winters with snow
- 100%
- Snow per year
- 114.2"
median, 1991–2020
median, 1991–2020
23 of 23 observed
NOAA normal
Frost risk by date in Corry
Half of springs at Union City Filtration Plant, PA see their last 32°F night by May 7; only one in ten is past it by April 23, and one in ten still has one after May 24. Planting tender crops after May 14 leaves a 30% risk of a frost on them, after May 19 20%, and after May 24 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 50% of the 176 Pennsylvania stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 10 in half of years, as early as September 29 one year in ten, and holds off past October 24 one year in ten. A hard freeze of 28°F follows 13 days later, around October 23; in spring the one-in-ten date for 28°F is May 12, 12 days before the 32°F one. The freeze-free season lasts 155 days in a typical year, shorter than at 82% of the 176 Pennsylvania stations; it reaches 175 days one year in ten and falls short of 134 one year in ten. On average 150 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 13 days longer, to about May 20, and return around September 30. Severe cold of 16°F or below comes every winter, usually between December 2 and March 22.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 5 | May 10 | May 13 | May 17 | May 20 | May 23 | May 26 | May 29 | Jun 1 |
| 32°F | Apr 23 | Apr 27 | Apr 30 | May 4 | May 7 | May 11 | May 14 | May 19 | May 24 |
| 28°F | Apr 9 | Apr 14 | Apr 18 | Apr 21 | Apr 24 | Apr 27 | May 1 | May 6 | May 12 |
| 24°F | Mar 29 | Apr 1 | Apr 4 | Apr 6 | Apr 9 | Apr 12 | Apr 16 | Apr 19 | Apr 24 |
| 20°F | Mar 18 | Mar 22 | Mar 26 | Mar 29 | Mar 31 | Apr 2 | Apr 4 | Apr 7 | Apr 12 |
| 16°F | Mar 9 | Mar 14 | Mar 17 | Mar 20 | Mar 22 | Mar 25 | Mar 28 | Mar 31 | Apr 2 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 17 | Sep 22 | Sep 25 | Sep 28 | Sep 30 | Oct 1 | Oct 4 | Oct 7 | Oct 11 |
| 32°F | Sep 29 | Oct 1 | Oct 4 | Oct 6 | Oct 10 | Oct 13 | Oct 15 | Oct 18 | Oct 24 |
| 28°F | Oct 6 | Oct 12 | Oct 16 | Oct 20 | Oct 23 | Oct 27 | Oct 31 | Nov 4 | Nov 10 |
| 24°F | Oct 21 | Oct 28 | Nov 1 | Nov 4 | Nov 8 | Nov 11 | Nov 15 | Nov 19 | Nov 26 |
| 20°F | Nov 5 | Nov 9 | Nov 13 | Nov 17 | Nov 21 | Nov 25 | Nov 29 | Dec 2 | Dec 7 |
| 16°F | Nov 14 | Nov 20 | Nov 25 | Nov 29 | Dec 2 | Dec 5 | Dec 9 | Dec 13 | Dec 18 |
Freeze probabilities 1991–2020 at Union City Filtration Plant, PA, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 16407 →Compare Corry with another place →
Compared with the next station
The nearest other station, Chandlers Valley 1SE, PA, 18 miles east of Corry, has a last frost 15 days later (May 22), a first frost 10 days earlier (September 30), a season 24 days shorter.
When it snows in Corry, Pennsylvania
The first measurable snow (0.1 inch or more) in Corry usually arrives around November 8, and the last of the season around April 8. Those are the middle dates across the winters of 1991–2020 at Union City Filtration Plant, PA, 10.8 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 29 days after the last snow.
Planting calendar for 16407
| When | What to do |
|---|---|
| February 26 – March 12 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 12 – March 26 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 9 – April 23 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 7 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 18 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 26 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 10 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 16407 is 11 miles from Union City Filtration Plant, PA, which stands at 1,400 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 16407 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Pennsylvania →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.