Bethlehem, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bethlehem, a community in Grafton County, New Hampshire.
Tonight
36°F
Mostly Clear then Areas Of Frost
Areas of frost after 5am. Mostly clear, with a low around 36. North wind 0 to 5 mph.
7-day forecast for Bethlehem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Mostly Clear then Areas Of Frost | 0 to 5 mph N | 0% |
| Saturday | 61°F | Areas Of Frost then Sunny | 0 to 5 mph N | 0% |
| Saturday Night | 38°F | Mostly Cloudy | 0 to 5 mph SE | 0% |
| Sunday | 58°F | Rain Showers | 0 to 5 mph S | 79% |
| Sunday Night | 41°F | Rain Showers Likely then Mostly Cloudy | 0 to 5 mph NE | 70% |
| Monday | 60°F | Mostly Sunny | 5 mph N | 1% |
| Monday Night | 37°F | Mostly Cloudy | 0 to 5 mph N | 1% |
| Tuesday | 62°F | Partly Sunny | 0 mph | 1% |
| Tuesday Night | 36°F | Partly Cloudy | 0 mph | 1% |
| Wednesday | 64°F | Mostly Sunny | 0 to 5 mph E | 1% |
| Wednesday Night | 37°F | Partly Cloudy | 0 to 5 mph E | 9% |
| Thursday | 63°F | Partly Sunny then Slight Chance Rain Showers | 0 mph | 19% |
| Thursday Night | 41°F | Chance Rain Showers | 0 mph | 27% |
| Friday | 65°F | Chance Rain Showers | 0 to 5 mph N | 25% |
Forecast source: National Weather Service (api.weather.gov) for Bethlehem (44.279, -71.689). Updated through the day.
Growing snapshot for Bethlehem
Last spring frost
May 24
First fall frost
Sep 18
Growing season
116 days
Hardiness zone
5a
More local growing data for Bethlehem: nearby ZIP 03574 weather · frost dates · planting calendar · New Hampshire frost dates
Nearby towns & communities
Ashland
Bristol
Canaan
Enfield
Lebanon
Lincoln
Lisbon
Littleton
Mountain Lakes
North Haverhill
North Woodstock
Plymouth
Woodsville
Climate data from the nearest NOAA station, Bethlehem 2, Nh (4 mi from Bethlehem). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.