Frost dates for Ottawa
◇ Station-measured · 84/100 confidence
Last spring frost (50%)
May 6
10% risk to May 23
First fall frost (50%)
Oct 2
10% risk from Sep 15
Frost-free days
149
May 6 → Oct 2
Köppen
Dfb
Continental, warm summer
The growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
GROWING SEASON — 149 DAYS
MAY 6
OCT 2