Oregon State University Extension Service


Frost dates in Baker County and areas

The average dates are established at the 50% level or half the times the frost may occur before or after that date. The safe date is when there is less than a 10% chance the frost will be after (for last frost) or that it will occur before (the first frost). You certainly will have your own little micro-climates around your landscape to modify your planting times. You can always use season extenders to modify these areas. These techniques are not limited to greenhouses or row covers.

Location Average Last Frost (Date) Safe Last Frost (Date) Average First Frost (Date) Safe First Frost (Date) Average Growing Season (Days) Safe Growing Season (Days)
Baker Airport 6/3 6/29 9/7 8/26 95 64
Baker Area 5/30 6/20 9/22 9/8 115 89
Halfway 6/11 7/3 9/10 8/28 90 64
Huntington 4/30 5/17 10/9 9/22 161 137
La Grande 5/17 6/11 9/26 9/9 130 98
Ontario 5/12 6/3 9/28 9/14 139 108
Richland 5/22 6/12 9/26 10/8 126 94
Union 5/24 6/12 9/17 9/2 116 94
Vale 5/13 6/2 9/30 9/16 139 114

Source URL: https://extension.oregonstate.edu/gardening/techniques/frost-dates-baker-county-areas