St. Johnsbury, VT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Johnsbury, a community in Caledonia County, Vermont.
Overnight
49°F
Mostly Cloudy
Mostly cloudy, with a low around 49. South wind around 5 mph.
7-day forecast for St. Johnsbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Cloudy | 5 mph S | 4% |
| Wednesday | 74°F | Partly Sunny | 3 mph S | 4% |
| Wednesday Night | 49°F | Mostly Cloudy | 3 mph S | 1% |
| Thursday | 65°F | Rain Showers | 6 mph S | 80% |
| Thursday Night | 50°F | Rain Showers Likely | 1 to 6 mph SW | 67% |
| Friday | 65°F | Patchy Fog then Mostly Cloudy | 1 mph W | 11% |
| Friday Night | 47°F | Chance Light Rain | 1 mph N | 47% |
| Saturday | 58°F | Chance Light Rain | 2 mph N | 47% |
| Saturday Night | 39°F | Chance Light Rain | 3 mph NW | 50% |
| Sunday | 50°F | Chance Light Rain | 5 mph NW | 48% |
| Sunday Night | 31°F | Slight Chance Light Rain | 2 mph W | 22% |
| Monday | 46°F | Chance Light Rain | 2 to 7 mph W | 33% |
| Monday Night | 27°F | Slight Chance Light Rain then Mostly Cloudy | 3 mph W | 23% |
| Tuesday | 49°F | Chance Light Rain | 2 to 6 mph SW | 31% |
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 Nov 4, 2026.