USDA Hardiness Zone 6b
Frost Dates for 10547 — Mohegan Lake, New York
NOAA 1991–2020 normals from Shrub Oak, NY (462 ft), 1 miles northeast.
Updated
In Mohegan Lake, the last spring frost (32°F) is around April 30 in half of years and has passed by May 13 in nine years out of ten. The first fall frost comes around October 17, as early as October 4 one year in ten, leaving a typical freeze-free season of 172 days (NOAA, Shrub Oak, NY).
- Last spring frost
- April 30
- First fall frost
- October 17
- Growing season
- 172 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 6
- Last snow
- March 22
- Winters with snow
- 100%
- Snow per year
- 39.5"
median, 1991–2020
median, 1991–2020
22 of 22 observed
NOAA normal
Frost risk by date in Mohegan Lake
Half of springs at Shrub Oak, NY see their last 32°F night by April 30; only one in ten is past it by April 16, and one in ten still has one after May 13. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 8 20%, and after May 13 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 83% of the 173 New York stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 17 in half of years, as early as October 4 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 13 days later, around October 30; in spring the one-in-ten date for 28°F is May 1, 12 days before the 32°F one. The freeze-free season lasts 172 days in a typical year, longer than at 69% of the 173 New York stations; it reaches 192 days one year in ten and falls short of 152 one year in ten. On average 136 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 10 days longer, to about May 10, and return around October 7. Severe cold of 16°F or below comes every winter, usually between December 6 and March 13.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 27 | May 1 | May 3 | May 7 | May 10 | May 12 | May 16 | May 20 | May 26 |
| 32°F | Apr 16 | Apr 20 | Apr 23 | Apr 27 | Apr 30 | May 2 | May 5 | May 8 | May 13 |
| 28°F | Apr 3 | Apr 8 | Apr 11 | Apr 14 | Apr 17 | Apr 20 | Apr 23 | Apr 27 | May 1 |
| 24°F | Mar 20 | Mar 27 | Mar 30 | Apr 1 | Apr 3 | Apr 5 | Apr 8 | Apr 12 | Apr 17 |
| 20°F | Mar 7 | Mar 13 | Mar 17 | Mar 20 | Mar 24 | Mar 27 | Mar 30 | Apr 1 | Apr 5 |
| 16°F | Feb 21 | Mar 1 | Mar 6 | Mar 9 | Mar 13 | Mar 16 | Mar 19 | Mar 23 | Mar 28 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 25 | Sep 30 | Oct 2 | Oct 4 | Oct 7 | Oct 9 | Oct 13 | Oct 16 | Oct 22 |
| 32°F | Oct 4 | Oct 9 | Oct 12 | Oct 14 | Oct 17 | Oct 21 | Oct 25 | Oct 28 | Nov 3 |
| 28°F | Oct 16 | Oct 20 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 8 | Nov 13 |
| 24°F | Oct 27 | Nov 1 | Nov 3 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 27 |
| 20°F | Nov 5 | Nov 11 | Nov 15 | Nov 19 | Nov 22 | Nov 27 | Nov 30 | Dec 3 | Dec 9 |
| 16°F | Nov 18 | Nov 25 | Nov 29 | Dec 2 | Dec 6 | Dec 10 | Dec 15 | Dec 20 | Dec 28 |
Freeze probabilities 1991–2020 at Shrub Oak, 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 10547 →Compare Mohegan Lake with another place →
Compared with the next station
The nearest other station, Yorktown Hts 1W, NY, 4 miles southeast of Mohegan Lake and 208 feet higher, has a last frost 5 days earlier (April 25), a first frost 2 days later (October 19), a season 2 days longer.
When it snows in Mohegan Lake, New York
The first measurable snow (0.1 inch or more) in Mohegan Lake usually arrives around December 6, and the last of the season around March 22. Those are the middle dates across the winters of 1991–2020 at Yorktown Hts 1W, NY, 4.3 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 39 days after the last snow.
Planting calendar for 10547
| When | What to do |
|---|---|
| February 19 – March 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 5 – March 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 2 – April 16 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 30 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 25 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 3 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 17 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 10547 is 1 mile from Shrub Oak, NY, which stands at 462 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station; its figures are presented in full for 10541 (Mahopac). The 2023 USDA Plant Hardiness Zone Map lists ZIP 10547 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.