St. Johnsbury, VT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johnsbury, a community in Caledonia County, Vermont.
Today
63°F
Sunny
Sunny, with a high near 63. North wind around 1 mph.
7-day forecast for St. Johnsbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Sunny | 1 mph N | 0% |
| Tonight | 38°F | Partly Cloudy | 2 mph SE | 0% |
| Sunday | 53°F | Rain Showers | 2 to 8 mph S | 95% |
| Sunday Night | 39°F | Chance Rain Showers then Mostly Cloudy | 0 to 5 mph N | 46% |
| Monday | 59°F | Partly Sunny | 5 mph N | 0% |
| Monday Night | 36°F | Mostly Cloudy | 3 mph N | 0% |
| Tuesday | 63°F | Partly Sunny | 2 mph N | 0% |
| Tuesday Night | 36°F | Partly Cloudy | 2 mph NE | 0% |
| Wednesday | 66°F | Mostly Sunny | 1 mph E | 0% |
| Wednesday Night | 36°F | Partly Cloudy | 1 mph E | 2% |
| Thursday | 65°F | Slight Chance Rain Showers | 1 mph NE | 19% |
| Thursday Night | 39°F | Chance Rain Showers | 1 mph N | 26% |
| Friday | 66°F | Slight Chance Rain Showers | 3 mph N | 23% |
| Friday Night | 40°F | Slight Chance Rain Showers | 3 mph N | 22% |
Forecast source: National Weather Service (api.weather.gov) for St. Johnsbury (44.430, -72.009). Updated through the day.
Growing snapshot for St. Johnsbury
Last spring frost
May 13
First fall frost
Oct 3
Growing season
143 days
Hardiness zone
4b
More local growing data for St. Johnsbury: nearby ZIP 05819 weather · frost dates · planting calendar · Vermont frost dates
Nearby towns & communities
Barnet
Danville
East Burke
Groton
Hardwick
Lyndon
Lyndon Center
Lyndonville
Peacham
Sheffield
Sutton
West Burke
Climate data from the nearest NOAA station, Saint Johnsbury, Vt (2.1 mi from St. Johnsbury). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.