Last Frost Date Saint John: Frost Dates, Late Frost Risk & Growing Season

When is the last spring frost and the first autumn frost in Saint John? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.

The frost season in Saint John

Last frost (average): May 5
In 1 year out of 10 it still freezes on May 17.
First frost: October 17
Frost-free season: 165 days
Frost after 15 May: in 13 % of years

Frost days per month in Saint John

January: 30.4 · -13 °C
February: 27.5 · -12 °C
March: 28.7 · -6 °C
April: 17.2 · 0 °C
May: 1.4 · 5 °C
June: 0 · 10 °C
July: 0 · 14 °C
August: 0 · 13 °C
September: 0 · 10 °C
October: 5.3 · 4 °C
November: 19.8 · -1 °C
December: 28.8 · -8 °C

No weather station nearby: plain grid values, which are often a little too cold – dates may therefore be late.
Daily minimum temperatures 2 m above ground over 30 years (1991–2020), NASA POWER; station data: Deutscher Wetterdienst (CC BY 4.0). Ground frost can form while the air at 2 m is still +2 to +3 °C.