Idaho Calculated Average and Minimum USDA Hardiness Zones

County	Weather Station	Elev. (feet)	Average Annual Minimum Temperature (°F)	Absolute Minimum (°F)	Average and Minimum Hardiness Zones	Years of Data
Ada	Boise Air Terminal	2814	3.2	-25.6	Zones 7a, 4a	30
Ada	Orchard Range Site	3150	-2.2	-29.2	Zones 6b, 4a	26
Ada	Swan Falls Power House	2325	6.8	-20.2	Zones 7b, 4b	30
Bear Lake	Bern	5964	-20.2	-29.2	Zones 4b, 4a	28
Bear Lake	Giveout	6930	-16.6	-32.8	Zones 5a, 3b	30
Bear Lake	Lifton Pumping Station	5935	-16.6	-29.2	Zones 5a, 4a	30
Bear Lake	Slug Creek Divide	7225	-13	-31	Zones 5b, 3b	30
Bingham	Aberdeen Exp. Stn.	4405	-13	-29.2	Zones 5b, 4a	30
Bingham	Sheep Mtn	6570	-9.4	-27.4	Zones 6a, 4a	30
Blaine	Chocolate Gulch	6440	-13	-22	Zones 5b, 4b	27
Blaine	Dollarhide Summit	8420	-5.8	-22	Zones 6a, 4b	30
Blaine	Galena Summit	8780	-11.2	-29.2	Zones 5b, 4a	30
Blaine	Garfield R.S.	6560	-11.2	-31	Zones 5b, 3b	30
Blaine	Hyndman	7440	-11.2	-29.2	Zones 5b, 4a	30
Blaine	Ketchum RS	5890	-13	-36.4	Zones 5b, 3a	30
Blaine	Lost Wood Divide	7900	-16.6	-25.6	Zones 5a, 4a	30
Blaine	Ohio Gulch Idaho	6220	-7.6	-27.4	Zones 6a, 4a	30
Blaine	Picabo	4839	-14.8	-36.4	Zones 5b, 3a	30
Blaine	Potter Butte Idaho	4930	-9.4	-32.8	Zones 6a, 3b	30
Blaine	Swede Peak	7640	-5.8	-25.6	Zones 6a, 4a	30
Blaine	Vienna Mine	8960	-11.2	-27.4	Zones 5b, 4a	30
Bonneville	Idaho Falls KIFI	4742	-11.2	-18.4	Zones 5b, 5a	30
Bonneville	Idaho Falls 16 SE	5828	-20.2	-41.8	Zones 4b, 2b	30
Bonneville	Idaho Falls Fanning Fld	4729	-14.8	-29.2	Zones 5b, 4a	27
Bonneville	Palisades	5384	-11.2	-18.4	Zones 5b, 5a	18
Bonneville	Swan Valley 2 E	5397	-16.6	-43.6	Zones 5a, 2b	30
Butte	Arco Idaho	5380	-22	-43.6	Zones 4b, 2b	30
Butte	Craters of the Moon	5914	-11.2	-29.2	Zones 5b, 4a	30
Butte	Idaho Falls 46 W	4938	-22	-38.2	Zones 4b, 3a	30
Camas	Fairfield RS	5065	-20.2	-32.8	Zones 4b, 3b	30
Canyon	Deer Flat Dam	2510	5	-22	Zones 7a, 4b	25
Canyon	Nampa Sugar Factory	2470	3.2	-25.6	Zones 7a, 4a	25
Canyon	Parma Exp St	2290	3.2	-20.2	Zones 7a, 4b	27
Caribou	Grace Idaho	6210	-2.2	-23.8	Zones 6b, 4b	30
Caribou	Grace	5550	-18.4	-40	Zones 5a, 3a	30
Caribou	Pole Canyon Idaho	6700	-2.2	-20.2	Zones 6b, 4b	30
Caribou	Somsen Ranch	6800	-13	-27.4	Zones 5b, 4a	30
Cassia	Bostetter R.S.	7500	-5.8	-22	Zones 6a, 4b	30
Cassia	Burley Muni Ap	4142	-4	-23.8	Zones 6b, 4b	30
Cassia	Goose Creek Idaho	5660	-2.2	-27.4	Zones 6b, 4a	30
Cassia	Howell Canyon	7980	-7.6	-25.6	Zones 6a, 4a	30
Cassia	Malta	4521	-7.6	-25.6	Zones 6a, 4a	26
Cassia	Moburg Canyon Idaho	6400	1.4	-18.4	Zones 7a, 5a	30
Cassia	Oakley	4600	-4	-23.8	Zones 6b, 4b	30
Cassia	Raft River Idaho	4400	-13	-34.6	Zones 5b, 3b	30
Elmore	Atlanta Summit	7580	-5.8	-23.8	Zones 6a, 4b	30
Elmore	Camas Creek Divide	5710	-4	-14.8	Zones 6b, 5b	30
Elmore	Deer Haven Idaho	5550	1.4	-22	Zones 7a, 4b	30
Elmore	Graham Guard St	5690	-20.2	-38.2	Zones 4b, 3a	30
Gooding	Hagerman 2 SW	2897	-0.4	-25.6	Zones 6b, 4a	29
Jerome	Hazelton	4060	-4	-23.8	Zones 6b, 4b	29
Jerome	Jerome	3740	-0.4	-23.8	Zones 6b, 4b	30
Lincoln	Richfield	4309	-9.4	-36.4	Zones 6a, 3a	30
Lincoln	Rock Lake Idaho	4260	-9.4	-34.6	Zones 6a, 3b	30
Lincoln	Shoshone 1 WNW	3950	-4	-27.4	Zones 6b, 4a	30
Minidoka	Minidoka Dam	4164	-7.6	-25.6	Zones 6a, 4a	30
Minidoka	Paul 1 ENE	4149	-4	-25.6	Zones 6b, 4a	29
Oneida	Flint Creek Idaho	5200	-0.4	-25.6	Zones 6b, 4a	30
Oneida	Malad City	4470	-9.4	-32.8	Zones 6a, 3b	29
Oneida	Oxford Spring	6740	-2.2	-22	Zones 6b, 4b	30
Owyhee	Brace Flat Idaho	4890	-11.2	-38.2	Zones 5b, 3a	30
Owyhee	Grand View 4 NW	2400	1.4	-29.2	Zones 7a, 4a	21
Owyhee	Horse Butte Idaho	5000	-0.4	-25.6	Zones 6b, 4a	30
Owyhee	Mud Flat	5730	-11.2	-34.6	Zones 5b, 3b	30
Owyhee	Murphy (Desert) Hot Springs	5152	-5.8	-27.4	Zones 6a, 4a	24
Owyhee	Pole Creek Idaho	5660	-4	-29.2	Zones 6b, 4a	30
Owyhee	Reynolds	3930	-0.4	-20.2	Zones 6b, 4b	25
Owyhee	South Mtn.	6500	3.2	-22	Zones 7a, 4b	30
Owyhee	Triangle Idaho	5270	-13	-38.2	Zones 5b, 3a	30
Owyhee	Twin Buttes Idaho	3350	1.4	-22	Zones 7a, 4b	30
Power	Bull Canyon Idaho	6400	-0.4	-20.2	Zones 6b, 4b	30
Power	Crystal Idaho	5064	-7.6	-36.4	Zones 6a, 3a	30
Power	Massacre Rocks SP	4195	-5.8	-25.6	Zones 6a, 4a	30
Power	Pocatello Rgnl Ap	4478	-11.2	-29.2	Zones 5b, 4a	30
Twin Falls	Buhl #2	3800	-0.4	-25.6	Zones 6b, 4a	26
Twin Falls	Bull Spring Idaho	5700	-16.6	-36.4	Zones 5a, 3a	30
Twin Falls	Castleford 2 N	3825	-2.2	-25.6	Zones 6b, 4a	29
Twin Falls	Magic Mountain	6880	-5.8	-27.4	Zones 6a, 4a	30
Twin Falls	Trail Gulch Idaho	6000	3.2	-20.2	Zones 7a, 4b	30
Twin Falls	Twin Falls Sun Vly Rgnl Ap	4151	-0.4	-14.8	Zones 6b, 5b	23