USDA Hardiness Zone 5b
Frost Dates for 13787 — Harpursville, New York
NOAA 1991–2020 normals from Deposit, NY (1,000 ft), 15 miles southeast.
Updated
In Harpursville, the last spring frost (32°F) is around May 12 in half of years and has passed by May 27 in nine years out of ten. The first fall frost comes around October 9, as early as September 26 one year in ten, leaving a typical freeze-free season of 152 days (NOAA, Deposit, NY).
- Last spring frost
- May 12
- First fall frost
- October 9
- Growing season
- 152 days
- Hardiness zone
- 5b
50% probability
50% probability
freeze-free, 50%
-15 to -10°F (-26.1 to -23.3°C) coldest night
- First snow
- November 13
- Last snow
- April 1
- Winters with snow
- 100%
- Snow per year
- 47.6"
median, 1991–2020
median, 1991–2020
19 of 19 observed
NOAA normal
Frost risk by date in Harpursville
Half of springs at Deposit, NY see their last 32°F night by May 12; only one in ten is past it by April 26, and one in ten still has one after May 27. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 22 20%, and after May 27 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 29% of the 173 New York stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 9 in half of years, as early as September 26 one year in ten, and holds off past October 25 one year in ten. A hard freeze of 28°F follows 15 days later, around October 24; in spring the one-in-ten date for 28°F is May 15, 12 days before the 32°F one. The freeze-free season lasts 152 days in a typical year, shorter than at 69% of the 173 New York stations; it reaches 173 days one year in ten and falls short of 130 one year in ten. On average 151 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 23, and return around October 1. Severe cold of 16°F or below comes every winter, usually between November 29 and March 24.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 6 | May 13 | May 17 | May 20 | May 23 | May 25 | May 28 | May 31 | Jun 4 |
| 32°F | Apr 26 | Apr 30 | May 5 | May 9 | May 12 | May 15 | May 19 | May 22 | May 27 |
| 28°F | Apr 11 | Apr 18 | Apr 22 | Apr 26 | Apr 29 | May 2 | May 6 | May 10 | May 15 |
| 24°F | Mar 31 | Apr 3 | Apr 7 | Apr 10 | Apr 14 | Apr 18 | Apr 21 | Apr 27 | May 2 |
| 20°F | Mar 20 | Mar 25 | Mar 28 | Mar 31 | Apr 2 | Apr 4 | Apr 7 | Apr 10 | Apr 16 |
| 16°F | Mar 9 | Mar 15 | Mar 18 | Mar 22 | Mar 24 | Mar 27 | Mar 30 | Apr 2 | Apr 5 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 17 | Sep 23 | Sep 25 | Sep 28 | Oct 1 | Oct 2 | Oct 4 | Oct 7 | Oct 12 |
| 32°F | Sep 26 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 11 | Oct 15 | Oct 19 | Oct 25 |
| 28°F | Oct 6 | Oct 11 | Oct 16 | Oct 20 | Oct 24 | Oct 27 | Oct 31 | Nov 3 | Nov 7 |
| 24°F | Oct 20 | Oct 27 | Oct 31 | Nov 2 | Nov 4 | Nov 8 | Nov 11 | Nov 15 | Nov 20 |
| 20°F | Nov 2 | Nov 7 | Nov 11 | Nov 14 | Nov 17 | Nov 20 | Nov 24 | Nov 28 | Dec 2 |
| 16°F | Nov 13 | Nov 19 | Nov 23 | Nov 26 | Nov 29 | Dec 1 | Dec 4 | Dec 8 | Dec 14 |
Freeze probabilities 1991–2020 at Deposit, NY, 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 13787 →Compare Harpursville with another place →
Weather by month in Harpursville
July is the warmest month at Deposit, NY, averaging 82°F by day and 59°F at night; January is the coldest at 33°F and 16°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 77% of years.
Warmth for growing adds up to 2,565 growing degree days a year (base 50°F), more than at 55% of the 173 New York stations. 33% of them (834) have built up by the end of June, and July adds the most, 635. Precipitation totals 46.0 inches a year, most in September (4.7") and least in February (2.5"); May to September bring 48% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 33 | 16 | 3.1 | 100% | 29 | 1 |
| Feb | 36 | 17 | 2.5 | 100% | 26 | 0 |
| Mar | 45 | 25 | 3.6 | 100% | 24 | 10 |
| Apr | 59 | 35 | 4.0 | 100% | 13 | 69 |
| May | 71 | 45 | 4.4 | 77% | 3 | 265 |
| Jun | 78 | 55 | 4.2 | 5% | <1 | 490 |
| Jul | 82 | 59 | 4.5 | 0% | 0 | 635 |
| Aug | 80 | 58 | 4.2 | 0% | 0 | 595 |
| Sep | 73 | 51 | 4.7 | 20% | <1 | 368 |
| Oct | 62 | 40 | 4.3 | 93% | 8 | 116 |
| Nov | 48 | 31 | 3.2 | 100% | 19 | 14 |
| Dec | 37 | 23 | 3.3 | 100% | 27 | 1 |
Monthly normals 1991–2020 at Deposit, NY (1,000 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Binghamton, NY, 17 miles west of Harpursville and 606 feet higher, has a last frost 10 days earlier (May 2), a first frost 2 days later (October 11), a season 10 days longer.
When it snows in Harpursville, New York
The first measurable snow (0.1 inch or more) in Harpursville usually arrives around November 13, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Greene, NY, 10.5 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 41 days after the last snow.
Planting calendar for 13787
| When | What to do |
|---|---|
| March 3 – March 17 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 17 – March 31 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 14 – April 28 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 12 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 17 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 25 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 9 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 13787 is 15 miles from Deposit, NY, which stands at 1,000 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 13865 (Windsor). The 2023 USDA Plant Hardiness Zone Map lists ZIP 13787 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.
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.