Winthrop, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in St. Lawrence County, New York.
Today
81°F
Sunny
Sunny, with a high near 81. Southwest wind 6 to 9 mph.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 6 to 9 mph SW | 0% |
| Tonight | 60°F | Clear | 3 to 8 mph SW | 1% |
| Wednesday | 85°F | Sunny | 2 to 6 mph SW | 0% |
| Wednesday Night | 67°F | Partly Cloudy | 3 mph SW | 14% |
| Thursday | 84°F | Showers And Thunderstorms Likely | 5 mph SW | 71% |
| Thursday Night | 67°F | Showers And Thunderstorms Likely | 5 mph SW | 71% |
| Friday | 82°F | Showers And Thunderstorms Likely | 6 mph SW | 55% |
| Friday Night | 64°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 mph SW | 55% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 6 mph SW | 32% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 6 mph SW | 29% |
| Sunday | 83°F | Mostly Sunny then Chance Showers And Thunderstorms | 6 to 12 mph SW | 26% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 10 mph SW | 50% |
| Monday | 81°F | Rain Showers Likely | 10 mph SW | 58% |
| Monday Night | 61°F | Chance Showers And Thunderstorms | 3 to 9 mph SW | 58% |
Forecast source: National Weather Service (api.weather.gov) for Winthrop (44.804, -74.810). Updated through the day.
Growing snapshot for Winthrop
Last spring frost
May 10
First fall frost
Oct 5
Growing season
148 days
Hardiness zone
4b
More local growing data for Winthrop: nearby ZIP 13697 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Brasher Falls
Canton
Colton
Cranberry Lake
DeKalb Junction
Edwards
Gouverneur
Hailesboro
Hammond
Hannawa Falls
Hermon
Heuvelton
Madrid
Massena
Norfolk
Norwood
Ogdensburg
Parishville
Potsdam
Rensselaer Falls
Richville
Star Lake
Waddington
Climate data from the nearest NOAA station, Lawrenceville 3 Sw, Ny (6.9 mi from Winthrop). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.