❄
When Is the Last Frost?
What to plant
Hardiness zones
By state
Home
›
States
›
Montana
›
Cities: O
Montana frost dates: O
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
R
S
T
U
V
W
Z
Ad
City
Last frost
First frost
Season
Zone
Oilmont
May 17
Sep 25
131 d
4a
Olive
May 16
Sep 28
135 d
4b
Olney
frost any month
5a
Opheim
Jun 1
Sep 7
98 d
3b
Otter
May 14
Sep 30
139 d
5a
Outlook
May 28
Sep 7
102 d
3b
Ovando
frost any month
5a
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
R
S
T
U
V
W
Z