USDA Hardiness Zone 6b
Frost Dates for 14589 — Williamson, New York
NOAA 1991–2020 normals from Sodus 1W, NY (444 ft), 5 miles east.
Updated
In Williamson, the last spring frost (32°F) is around May 6 in half of years and has passed by May 21 in nine years out of ten. The first fall frost comes around October 10, as early as September 27 one year in ten, leaving a typical freeze-free season of 158 days (NOAA, Sodus 1W, NY).
- Last spring frost
- May 6
- First fall frost
- October 10
- Growing season
- 158 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
- November 16
- Last snow
- April 7
- Winters with snow
- 100%
- Snow per year
- 104.9"
median, 1991–2020
median, 1991–2020
26 of 26 observed
NOAA normal
Frost risk by date in Williamson
Half of springs at Sodus 1W, NY see their last 32°F night by May 6; only one in ten is past it by April 24, and one in ten still has one after May 21. Planting tender crops after May 13 leaves a 30% risk of a frost on them, after May 16 20%, and after May 21 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 10 in half of years, as early as September 27 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 15 days later, around October 25; in spring the one-in-ten date for 28°F is May 12, 9 days before the 32°F one. The freeze-free season lasts 158 days in a typical year, shorter than at 56% of the 173 New York stations; it reaches 177 days one year in ten and falls short of 138 one year in ten. On average 132 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 19, and return around September 29. Severe cold of 16°F or below comes every winter, usually between December 1 and March 23.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 4 | May 9 | May 13 | May 16 | May 19 | May 22 | May 25 | May 29 | Jun 3 |
| 32°F | Apr 24 | Apr 28 | Apr 30 | May 3 | May 6 | May 9 | May 13 | May 16 | May 21 |
| 28°F | Apr 10 | Apr 16 | Apr 19 | Apr 23 | Apr 25 | Apr 28 | May 1 | May 5 | May 12 |
| 24°F | Mar 31 | Apr 3 | Apr 6 | Apr 9 | Apr 12 | Apr 16 | Apr 19 | Apr 23 | Apr 30 |
| 20°F | Mar 17 | Mar 23 | Mar 27 | Mar 31 | Apr 1 | Apr 3 | Apr 5 | Apr 8 | Apr 15 |
| 16°F | Mar 9 | Mar 13 | Mar 17 | Mar 20 | Mar 23 | Mar 26 | Mar 29 | Apr 1 | Apr 4 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 16 | Sep 21 | Sep 24 | Sep 27 | Sep 29 | Oct 1 | Oct 4 | Oct 7 | Oct 13 |
| 32°F | Sep 27 | Oct 1 | Oct 4 | Oct 7 | Oct 10 | Oct 14 | Oct 17 | Oct 22 | Oct 28 |
| 28°F | Oct 6 | Oct 12 | Oct 17 | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 8 |
| 24°F | Oct 21 | Oct 28 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 13 | Nov 17 | Nov 23 |
| 20°F | Nov 3 | Nov 8 | Nov 12 | Nov 15 | Nov 19 | Nov 22 | Nov 26 | Dec 1 | Dec 5 |
| 16°F | Nov 14 | Nov 19 | Nov 23 | Nov 27 | Dec 1 | Dec 3 | Dec 7 | Dec 11 | Dec 18 |
Freeze probabilities 1991–2020 at Sodus 1W, 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 14589 →Compare Williamson with another place →
Weather by month in Williamson
July is the warmest month at Sodus 1W, NY, averaging 79°F by day and 59°F at night; January is the coldest at 31°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 69% of years.
Warmth for growing adds up to 2,312 growing degree days a year (base 50°F), fewer than at 61% of the 173 New York stations. 31% of them (719) have built up by the end of June, and July adds the most, 589. Precipitation totals 40.0 inches a year, most in October (4.3") and least in February (2.5"); May to September bring 44% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 31 | 16 | 3.0 | 100% | 28 | 1 |
| Feb | 33 | 17 | 2.5 | 100% | 25 | 0 |
| Mar | 41 | 24 | 2.7 | 100% | 24 | 9 |
| Apr | 54 | 34 | 3.2 | 100% | 11 | 55 |
| May | 67 | 45 | 3.4 | 69% | 1 | 216 |
| Jun | 75 | 54 | 3.5 | 0% | 0 | 438 |
| Jul | 79 | 59 | 3.6 | 0% | 0 | 589 |
| Aug | 78 | 58 | 3.8 | 0% | 0 | 550 |
| Sep | 72 | 51 | 3.4 | 17% | <1 | 342 |
| Oct | 59 | 41 | 4.3 | 92% | 3 | 97 |
| Nov | 47 | 31 | 3.4 | 100% | 15 | 14 |
| Dec | 36 | 23 | 3.2 | 100% | 25 | 2 |
Monthly normals 1991–2020 at Sodus 1W, NY (444 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, Webster 2 NE, NY, 10 miles west of Williamson and 169 feet lower, has a last frost 5 days earlier (May 1), a first frost 10 days later (October 20), a season 13 days longer.
When it snows in Williamson, New York
The first measurable snow (0.1 inch or more) in Williamson usually arrives around November 16, and the last of the season around April 7. Those are the middle dates across the winters of 1991–2020 at Sodus 1W, NY, 5.1 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 29 days after the last snow.
Planting calendar for 14589
| When | What to do |
|---|---|
| February 25 – March 11 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 11 – March 25 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 8 – April 22 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 6 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 14589 is 5 miles from Sodus 1W, NY, which stands at 444 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 14589 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.
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.