Cold Spring Harbor, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cold Spring Harbor, a community in Suffolk County, New York.
Today
70°F
Partly Sunny
Partly sunny. High near 70, with temperatures falling to around 63 in the afternoon. Southwest wind 7 to 10 mph.
7-day forecast for Cold Spring Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Partly Sunny | 7 to 10 mph SW | 0% |
| Tonight | 52°F | Partly Cloudy | 5 mph SW | 0% |
| Wednesday | 71°F | Mostly Sunny | 3 to 8 mph SW | 0% |
| Wednesday Night | 57°F | Mostly Cloudy | 7 mph SW | 0% |
| Thursday | 71°F | Chance Rain Showers | 5 to 10 mph S | 25% |
| Thursday Night | 60°F | Showers And Thunderstorms Likely | 3 to 8 mph SW | 65% |
| Friday | 69°F | Showers And Thunderstorms | 3 to 7 mph S | 79% |
| Friday Night | 53°F | Showers And Thunderstorms then Light Rain | 6 mph W | 79% |
| Saturday | 65°F | Light Rain Likely | 7 mph NW | 60% |
| Saturday Night | 46°F | Chance Light Rain | 7 mph NW | 28% |
| Sunday | 61°F | Slight Chance Light Rain then Mostly Sunny | 8 mph NW | 16% |
| Sunday Night | 45°F | Partly Cloudy then Slight Chance Light Rain | 6 mph NW | 18% |
| Monday | 59°F | Chance Light Rain | 7 to 12 mph NW | 32% |
| Monday Night | 42°F | Chance Light Rain | 12 mph NW | 30% |
Forecast source: National Weather Service (api.weather.gov) for Cold Spring Harbor (40.864, -73.456). Updated through the day.
Growing snapshot for Cold Spring Harbor
Last spring frost
Apr 9
First fall frost
Nov 10
Growing season
215 days
Hardiness zone
7b
More local growing data for Cold Spring Harbor: nearby ZIP 11724 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Centerport, Ny (4.5 mi from Cold Spring Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.