Frost Dates for Union, OR

Elevation: 846 m

Frost Dates

Last Spring Frost (50%) May 11

First Fall Frost (50%) September 26

30% Probability

Last Spring Frost May 19

First Fall Frost September 20

Hard Freeze (28°F)

Last Spring Hard Freeze April 24

First Fall Hard Freeze October 7

45.20°N, 117.86°W © OpenStreetMap

Growing Season

138 Days May 11 to September 26

USDA Hardiness Zone

Zone 6b

Avg. annual minimum: −5 to 0°F

Learn more

Köppen Climate

Dsb Warm-Summer Continental (Dry Summer)

Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.

Köppen climate map

Temperature

20° 40° 60° 80°

33°

Jan

36°

Feb

42°

Mar

47°

Apr

55°

May

61°

Jun

68°

Jul

69°

Aug

60°

Sep

49°

Oct

39°

Nov

32°

Dec

32°F

28°F

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Temperature table

Average monthly temperatures (°F)
Month	Avg High	Avg Temp	Avg Low
January	40°	33°	25°
February	45°	36°	27°
March	53°	42°	31°
April	59°	47°	34°
May	68°	55°	41°
June	74°	61°	47°
July	86°	68°	51°
August	87°	69°	50°
September	77°	60°	43°
October	63°	49°	34°
November	48°	39°	31°
December	39°	32°	25°

Precipitation

0" 1" 2" 3" 3.1"

1.4"

Jan

1.3"

Feb

1.8"

Mar

2.5"

Apr

3.1"

May

2.5"

Jun

2.2"

Jul

2.2"

Aug

2.3"

Sep

2.2"

Oct

2.0"

Nov

1.9"

Dec

Precipitation table

Average monthly precipitation (inches)
Month	Precipitation
January	1.4
February	1.3
March	1.8
April	2.5
May	3.1
June	2.5
July	2.2
August	2.2
September	2.3
October	2.2
November	2.0
December	1.9

Sunrise / Sunset

Jan: 7:32 AM – 4:28 PM · 8h 55m

Feb: 6:55 AM – 5:05 PM · 10h 10m

Mar: 6:11 AM – 5:49 PM · 11h 37m

Apr: 5:22 AM – 6:38 PM · 13h 17m

May: 4:40 AM – 7:20 PM · 14h 40m

Jun: 4:17 AM – 7:43 PM · 15h 26m

Jul: 4:26 AM – 7:34 PM · 15h 07m

Aug: 5:03 AM – 6:57 PM · 13h 54m

Sep: 5:51 AM – 6:09 PM · 12h 18m

Oct: 6:39 AM – 5:21 PM · 10h 42m

Nov: 7:22 AM – 4:38 PM · 9h 16m

Dec: 7:43 AM – 4:17 PM · 8h 34m

Daylight Longest: 15h 27m · Shortest: 8h 33m

Sunrise and sunset table

Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month	Sunrise	Sunset	Daylight
January	7:32 AM	4:28 PM	8h 55m
February	6:55 AM	5:05 PM	10h 10m
March	6:11 AM	5:49 PM	11h 37m
April	5:22 AM	6:38 PM	13h 17m
May	4:40 AM	7:20 PM	14h 40m
June	4:17 AM	7:43 PM	15h 26m
July	4:26 AM	7:34 PM	15h 07m
August	5:03 AM	6:57 PM	13h 54m
September	5:51 AM	6:09 PM	12h 18m
October	6:39 AM	5:21 PM	10h 42m
November	7:22 AM	4:38 PM	9h 16m
December	7:43 AM	4:17 PM	8h 34m

Nearby Stations

La Grande, ORMay 6 - October 1 Baker City Muni AP, OR May 25 - September 15 Elgin, ORMay 24 - September 18 Wallowa, ORJune 7 - September 9 Joseph, ORMay 24 - October 1 Meacham, OR

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!