USDA Hardiness Zone 7a
Frost Dates for 11952 — Mattituck, New York
NOAA 1991–2020 normals from Mattituck, NY (20 ft), 2 miles east.
Updated
In Mattituck, the last spring frost (32°F) is around April 19 in half of years and has passed by May 4 in nine years out of ten. The first fall frost comes around November 1, as early as October 17 one year in ten, leaving a typical freeze-free season of 196 days (NOAA, Mattituck, NY).
- Last spring frost
- April 19
- First fall frost
- November 1
- Growing season
- 196 days
- Hardiness zone
- 7a
50% probability
50% probability
freeze-free, 50%
0 to 5°F (-17.8 to -15.0°C) coldest night
- First snow
- December 17
- Last snow
- March 18
- Winters with snow
- 100%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
25 of 25 observed
NOAA normal
Frost risk by date in Mattituck
Half of springs at Mattituck, NY see their last 32°F night by April 19; only one in ten is past it by April 5, and one in ten still has one after May 4. Planting tender crops after April 25 leaves a 30% risk of a frost on them, after April 29 20%, and after May 4 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 November 1 in half of years, as early as October 17 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 11 days later, around November 12; in spring the one-in-ten date for 28°F is April 19, 15 days before the 32°F one. The freeze-free season lasts 196 days in a typical year, longer than at 88% of the 173 New York stations; it reaches 214 days one year in ten and falls short of 175 one year in ten. On average 105 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 14 days longer, to about May 3, and return around October 21. Severe cold of 16°F or below comes every winter, usually between December 20 and March 4.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 24 | Apr 27 | Apr 30 | May 3 | May 5 | May 8 | May 12 | May 16 |
| 32°F | Apr 5 | Apr 10 | Apr 14 | Apr 16 | Apr 19 | Apr 22 | Apr 25 | Apr 29 | May 4 |
| 28°F | Mar 22 | Mar 28 | Mar 31 | Apr 2 | Apr 4 | Apr 7 | Apr 10 | Apr 14 | Apr 19 |
| 24°F | Mar 8 | Mar 14 | Mar 17 | Mar 21 | Mar 24 | Mar 27 | Mar 30 | Apr 1 | Apr 4 |
| 20°F | Feb 25 | Mar 3 | Mar 7 | Mar 10 | Mar 13 | Mar 16 | Mar 19 | Mar 23 | Mar 29 |
| 16°F | Feb 9 | Feb 19 | Feb 24 | Feb 28 | Mar 4 | Mar 6 | Mar 10 | Mar 15 | Mar 20 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 6 | Oct 11 | Oct 14 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Oct 31 | Nov 4 |
| 32°F | Oct 17 | Oct 23 | Oct 26 | Oct 30 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 14 |
| 28°F | Oct 30 | Nov 2 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 22 | Nov 28 |
| 24°F | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 25 | Nov 28 | Dec 1 | Dec 4 | Dec 10 |
| 20°F | Nov 21 | Nov 27 | Dec 1 | Dec 4 | Dec 6 | Dec 10 | Dec 13 | Dec 18 | Dec 25 |
| 16°F | Dec 2 | Dec 8 | Dec 12 | Dec 16 | Dec 20 | Dec 24 | Dec 28 | Jan 1 | Jan 7 |
Freeze probabilities 1991–2020 at Mattituck, 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 11952 →Compare Mattituck with another place →
Compared with the next station
The nearest other station, Riverhead Rsch Farm, NY, 10 miles west of Mattituck, has a last frost 13 days earlier (April 6), a first frost 8 days later (November 9), a season 19 days longer.
When it snows in Mattituck, New York
The first measurable snow (0.1 inch or more) in Mattituck usually arrives around December 17, and the last of the season around March 18. Those are the middle dates across the winters of 1991–2020 at Riverhead Rsch Farm, NY, 9.6 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 32 days after the last snow.
Planting calendar for 11952
| When | What to do |
|---|---|
| February 8 – February 22 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 22 – March 8 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 22 – April 5 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 19 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 9 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 18 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 1 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 11952 is 2 miles from Mattituck, NY, which stands at 20 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 11971 (Southold). The 2023 USDA Plant Hardiness Zone Map lists ZIP 11952 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°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.