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When Is the Last Frost?
What to plant
Hardiness zones
By state
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Oregon frost dates: U
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City
Last frost
First frost
Season
Zone
Ukiah
May 7
Oct 4
150 d
6b
Umatilla
Apr 27
Oct 7
163 d
7b
Umpqua
Mar 31
Nov 5
219 d
9a
Union
May 11
Sep 26
138 d
6b
Unity
frost any month
6a
A
B
C
D
E
F
G
H
I
J
K
L
M
N
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U
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Y