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When Is the Last Frost?
What to plant
Hardiness zones
By state
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Montana frost dates: U
A
B
C
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H
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M
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O
P
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U
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City
Last frost
First frost
Season
Zone
Ulm
May 21
Sep 19
121 d
4a
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
R
S
T
U
V
W
Z