USDA Hardiness Zone 6a
Frost Dates for 16239 — Marienville, Pennsylvania
NOAA 1991–2020 normals from Cooksburg 2 NW, PA (1,450 ft), 11 miles southwest.
Updated
In Marienville, the last spring frost (32°F) is around May 13 in half of years and has passed by May 28 in nine years out of ten. The first fall frost comes around October 7, as early as September 27 one year in ten, leaving a typical freeze-free season of 143 days (NOAA, Cooksburg 2 NW, PA).
- Last spring frost
- May 13
- First fall frost
- October 7
- Growing season
- 143 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 4
- Last snow
- April 5
- Winters with snow
- 100%
- Snow per year
- 74.4"
median, 1991–2020
median, 1991–2020
19 of 19 observed
NOAA normal
Frost risk by date in Marienville
Half of springs at Cooksburg 2 NW, PA see their last 32°F night by May 13; only one in ten is past it by April 28, and one in ten still has one after May 28. Planting tender crops after May 21 leaves a 30% risk of a frost on them, after May 24 20%, and after May 28 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 72% of the 176 Pennsylvania stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 7 in half of years, as early as September 27 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 13 days later, around October 20; in spring the one-in-ten date for 28°F is May 20, 8 days before the 32°F one. The freeze-free season lasts 143 days in a typical year, shorter than at 91% of the 176 Pennsylvania stations; it reaches 165 days one year in ten and falls short of 124 one year in ten. On average 166 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 26, and return around September 27. Severe cold of 16°F or below comes every winter, usually between November 24 and March 26.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 11 | May 16 | May 20 | May 23 | May 26 | May 29 | May 31 | Jun 2 | Jun 7 |
| 32°F | Apr 28 | May 2 | May 6 | May 10 | May 13 | May 17 | May 21 | May 24 | May 28 |
| 28°F | Apr 17 | Apr 22 | Apr 26 | Apr 30 | May 2 | May 6 | May 9 | May 14 | May 20 |
| 24°F | Apr 4 | Apr 9 | Apr 13 | Apr 17 | Apr 19 | Apr 22 | Apr 26 | Apr 30 | May 6 |
| 20°F | Mar 21 | Mar 28 | Mar 31 | Apr 2 | Apr 5 | Apr 7 | Apr 10 | Apr 15 | Apr 19 |
| 16°F | Mar 11 | Mar 17 | Mar 20 | Mar 24 | Mar 26 | Mar 30 | Apr 1 | Apr 3 | Apr 7 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 12 | Sep 18 | Sep 21 | Sep 24 | Sep 27 | Sep 29 | Oct 1 | Oct 3 | Oct 7 |
| 32°F | Sep 27 | Sep 30 | Oct 2 | Oct 4 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 20 |
| 28°F | Oct 4 | Oct 9 | Oct 14 | Oct 17 | Oct 20 | Oct 23 | Oct 26 | Oct 30 | Nov 3 |
| 24°F | Oct 18 | Oct 25 | Oct 30 | Nov 1 | Nov 3 | Nov 5 | Nov 9 | Nov 12 | Nov 16 |
| 20°F | Nov 2 | Nov 5 | Nov 9 | Nov 11 | Nov 14 | Nov 16 | Nov 19 | Nov 23 | Nov 29 |
| 16°F | Nov 10 | Nov 14 | Nov 18 | Nov 21 | Nov 24 | Nov 28 | Dec 1 | Dec 5 | Dec 12 |
Freeze probabilities 1991–2020 at Cooksburg 2 NW, 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 16239 →Compare Marienville with another place →
Compared with the next station
The nearest other station, Tionesta 2 SE Lake, PA, 16 miles west of Marienville and 250 feet lower, has a last frost 12 days earlier (May 1), a first frost 18 days later (October 25), a season 33 days longer.
When it snows in Marienville, Pennsylvania
The first measurable snow (0.1 inch or more) in Marienville usually arrives around November 4, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at West Hickory 2, PA, 15.1 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 38 days after the last snow.
Planting calendar for 16239
| When | What to do |
|---|---|
| March 4 – March 18 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 18 – April 1 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 15 – April 29 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 13 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 15 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 23 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 7 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 16239 is 11 miles from Cooksburg 2 NW, PA, which stands at 1,450 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 16239 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.