USDA Hardiness Zone 6b
Frost Dates for 15425 — Connellsville, Pennsylvania
NOAA 1991–2020 normals from Connellsville 2 SSW, PA (900 ft), 2 miles south.
Updated
In Connellsville, the last spring frost (32°F) is around April 22 in half of years and has passed by May 11 in nine years out of ten. The first fall frost comes around October 27, as early as October 14 one year in ten, leaving a typical freeze-free season of 187 days (NOAA, Connellsville 2 SSW, PA).
- Last spring frost
- April 22
- First fall frost
- October 27
- Growing season
- 187 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- December 11
- Last snow
- March 10
- Winters with snow
- 100%
- Snow per year
- 24.4"
median, 1991–2020
median, 1991–2020
25 of 25 observed
NOAA normal
Frost risk by date in Connellsville
Half of springs at Connellsville 2 SSW, PA see their last 32°F night by April 22; only one in ten is past it by April 6, and one in ten still has one after May 11. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 5 20%, and after May 11 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 90% of the 176 Pennsylvania stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 27 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 12 days later, around November 8; in spring the one-in-ten date for 28°F is April 24, 17 days before the 32°F one. The freeze-free season lasts 187 days in a typical year, longer than at 75% of the 176 Pennsylvania stations; it reaches 209 days one year in ten and falls short of 165 one year in ten. On average 116 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 11 days longer, to about May 3, and return around October 17. Severe cold of 16°F or below comes every winter, usually between December 19 and March 6.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 19 | Apr 23 | Apr 26 | Apr 30 | May 3 | May 8 | May 11 | May 16 | May 22 |
| 32°F | Apr 6 | Apr 12 | Apr 16 | Apr 19 | Apr 22 | Apr 25 | Apr 30 | May 5 | May 11 |
| 28°F | Mar 23 | Mar 30 | Apr 2 | Apr 4 | Apr 7 | Apr 10 | Apr 14 | Apr 18 | Apr 24 |
| 24°F | Mar 10 | Mar 16 | Mar 19 | Mar 23 | Mar 27 | Mar 30 | Apr 1 | Apr 4 | Apr 9 |
| 20°F | Feb 25 | Mar 4 | Mar 8 | Mar 12 | Mar 15 | Mar 18 | Mar 21 | Mar 25 | Mar 30 |
| 16°F | Feb 12 | Feb 20 | Feb 26 | Mar 2 | Mar 6 | Mar 8 | Mar 12 | Mar 17 | Mar 21 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 8 | Oct 11 | Oct 14 | Oct 17 | Oct 19 | Oct 22 | Oct 25 | Oct 30 |
| 32°F | Oct 14 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Oct 31 | Nov 1 | Nov 5 | Nov 10 |
| 28°F | Oct 25 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 13 | Nov 17 | Nov 23 |
| 24°F | Nov 4 | Nov 9 | Nov 12 | Nov 14 | Nov 17 | Nov 22 | Nov 27 | Dec 2 | Dec 9 |
| 20°F | Nov 12 | Nov 17 | Nov 24 | Nov 29 | Dec 2 | Dec 6 | Dec 11 | Dec 17 | Dec 25 |
| 16°F | Nov 25 | Dec 1 | Dec 8 | Dec 12 | Dec 19 | Dec 23 | Dec 28 | Jan 1 | Jan 10 |
Freeze probabilities 1991–2020 at Connellsville 2 SSW, 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 15425 →Compare Connellsville with another place →
Compared with the next station
The nearest other station, Uniontown 1 NE, PA, 10 miles southwest of Connellsville, has a last frost 8 days later (April 30), a first frost 9 days earlier (October 18), a season 16 days shorter.
When it snows in Connellsville, Pennsylvania
The first measurable snow (0.1 inch or more) in Connellsville usually arrives around December 11, and the last of the season around March 10. Those are the middle dates across the winters of 1991–2020 at Connellsville 2 SSW, PA, 2 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 43 days after the last snow.
Planting calendar for 15425
| When | What to do |
|---|---|
| February 11 – February 25 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 25 – March 11 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 25 – April 8 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 22 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 4 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 13 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 27 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 15425 is 2 miles from Connellsville 2 SSW, PA, which stands at 900 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 15425 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°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.