First and Last Frost Dates of Idaho with Map

  • SheelaBy
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Idaho has many different weather areas, which means frost comes at different times in different places. In Boise, plants can grow for about 190 days, but in Island Park, they only have 59 days. This makes a big difference for people who grow plants or farm in Idaho.

Big cities like Boise, Meridian, and Nampa have longer growing times. But towns high up in the mountains, like McCall and Stanley, have shorter times to grow plants. In these high places, the last frost in spring can happen as late as June, and the first frost in fall can come as early as September.

This guide gives frost date info for Idaho towns and cities. It tells you where the nearest weather stations are and how far away they are. This helps gardeners and farmers plan when to plant and when to harvest better.

Idaho Frost Dates Map

Please select or type your Idaho location in the selection box below, to find its frost dates.

Idaho Frost Dates Map

City Name

Idaho Frost Dates

Spring Last Frost
—
—
Fall First Frost
—
—
The nearest weather station to your location is — and is located at a distance of —.
These dates are based on NOAA Data with 30% probability derived from “U.S. Climate Normals 2020: U.S. Annual/Seasonal Climate Normals (1991-2020)”. This means there is a 30% chance that the first fall frost may occur before the shown date, and the last spring frost may occur after the shown date.

First & Last Frost Dates of Idaho Cities and Towns

This frost date info comes from NCEI.gov’s U.S. Climate Normals 2020, looking at weather from 1991-2020. The dates in the table show when there’s a 30% chance of frost.

When we talk about “First” and “Last” frost dates, remember these aren’t exact dates. They’re good guesses. The “Last Spring Frost Date” means it’s usually safe to plant outside after this date, but there’s still a small chance (30%) it might frost later.

The “First Fall Frost Date” is when frost usually starts, but it might come a bit earlier (30% chance). Use these dates as a guide for gardening – they’re usually right, but not always!

If you see -9999.0 in the table, it means that weather station don’t have frost info.

City Station ID Distance (mi) Fall First Frost Spring Last Frost Growing Season (Days)
Boise City USW00024131 3.85 10/14 04/30 190.0
Meridian USW00024131 8.18 10/14 04/30 190.0
Nampa USC00106305 1.90 10/06 05/05 172.0
Caldwell USC00102444 6.70 10/13 04/29 186.0
Idaho Falls USC00104455 2.04 09/25 05/17 151.0
Pocatello USC00107210 0.91 10/05 05/09 169.0
Coeur d’Alene USC00101956 0.94 10/12 04/29 188.0
Twin Falls USC00109293 1.85 10/03 05/04 169.0
Post Falls USC00101956 7.62 10/12 04/29 188.0
Rexburg USW00094194 0.96 09/18 05/21 138.0
Lewiston USW00024149 2.13 10/18 04/14 211.0
Eagle USC00101017 8.14 10/05 05/28 157.0
Kuna USW00024131 10.38 10/14 04/30 190.0
Ammon USC00104455 3.83 09/25 05/17 151.0
Mountain Home USC00106174 1.15 10/01 05/10 167.0
Hayden USC00101956 5.81 10/12 04/29 188.0
Chubbuck USC00107210 3.31 10/05 05/09 169.0
Star USC00106305 7.34 10/06 05/05 172.0
Jerome USC00104670 0.58 10/08 05/10 175.0
Blackfoot USC00100915 0.09 09/28 05/11 157.0
Garden City USW00024131 3.83 10/14 04/30 190.0
Burley USW00024133 1.42 09/29 05/12 159.0
Rathdrum USC00101956 10.13 10/12 04/29 188.0
Middleton USC00106305 7.46 10/06 05/05 172.0
Sandpoint USC00108137 1.29 09/22 05/15 149.0
Hailey USC00100774 4.65 09/25 05/19 150.0
Payette USC00106891 0.18 10/14 04/27 192.0
Emmett USC00102942 2.10 10/11 05/07 176.0
Fruitland USC00106891 4.81 10/14 04/27 192.0
Rupert USC00106877 4.38 09/30 05/13 158.0
Preston USC00107346 0.37 09/23 05/24 143.0
Weiser USC00109638 0.37 10/08 04/30 182.0
Rigby USC00107689 0.28 09/30 05/15 156.0
Kimberly USC00109303 1.26 09/27 05/12 159.0
Shelley USW00024145 9.75 09/12 06/02 125.0
American Falls USC00100218 2.72 10/02 05/10 163.0
Buhl USC00101220 0.73 10/09 05/01 181.0
McCall USW00094182 1.41 09/05 06/17 102.0
St. Anthony USC00108022 1.02 09/15 05/25 137.0
Gooding USC00103932 13.84 09/26 05/08 158.0
Heyburn USW00024133 1.17 09/29 05/12 159.0
Lincoln USC00104455 2.41 09/25 05/17 151.0
Grangeville USC00103771 1.09 09/26 05/15 155.0
Hidden Springs USC00101017 3.10 10/05 05/28 157.0
Orofino USC00102845 3.54 10/12 04/27 192.0
Salmon USC00108080 0.53 09/18 05/25 135.0
Mountain Home AFB USC00106174 9.45 10/01 05/10 167.0
Homedale USC00104318 1.04 10/03 04/29 176.0
Iona USC00104455 4.07 09/25 05/17 151.0
Wendell USC00104670 9.85 10/08 05/10 175.0
Filer USC00101220 7.30 10/09 05/01 181.0
Montpelier USC00100803 4.55 08/29 06/25 86.0
Bonners Ferry USC00101079 0.29 09/27 05/06 162.0
Fort Hall USC00103297 1.37 09/13 05/31 128.0
Bellevue USC00100774 0.27 09/25 05/19 150.0
Dalton Gardens USC00101956 3.50 10/12 04/29 188.0
Spirit Lake USC00100667 14.34 09/15 05/28 132.0
St. Maries USC00108062 0.77 09/27 05/10 161.0
Kellogg USC00104831 0.33 09/19 05/21 140.0
Malad City USW00024151 3.47 09/14 06/01 127.0
Victor USC00102676 8.85 09/02 06/20 95.0
Driggs USC00102676 0.52 09/02 06/20 95.0
Parma USC00106844 1.18 10/04 05/01 173.0
Sugar City USC00108818 1.11 09/06 06/05 116.0
Ponderay USC00108137 1.54 09/22 05/15 149.0
Aberdeen USC00100010 0.93 09/13 05/31 128.0
Priest River USC00107386 12.26 09/07 05/27 125.0
Pinehurst USC00104831 5.39 09/19 05/21 140.0
Paul USC00106877 1.08 09/30 05/13 158.0
Shoshone USC00108380 0.58 10/10 05/01 182.0
Wilder USC00104318 4.91 10/03 04/29 176.0
Osburn USC00109498 3.82 09/27 05/11 158.0
New Plymouth USC00106891 9.23 10/14 04/27 192.0
Tyhee USC00107208 5.07 09/26 05/25 148.0
Moreland USC00100915 5.22 09/28 05/11 157.0
Avimor USC00101017 3.87 10/05 05/28 157.0
Glenns Ferry USC00103631 1.51 09/26 05/06 164.0
Marsing USC00102444 3.92 10/13 04/29 186.0
Robie Creek USC00100448 4.50 10/08 05/04 178.0
Ucon USC00107689 6.08 09/30 05/15 156.0
Lapwai USW00024149 10.25 10/18 04/14 211.0
Groveland USC00100915 2.38 09/28 05/11 157.0
Kamiah USC00104793 0.34 09/30 05/03 172.0
Franklin USC00107346 6.73 09/23 05/24 143.0
Plummer USC00107188 3.51 09/29 05/21 155.0
Hansen USC00109303 2.55 09/27 05/12 159.0
Dover USC00108137 3.69 09/22 05/15 149.0
Moyie Springs USC00101079 6.02 09/27 05/06 162.0
Riverside USC00100915 4.55 09/28 05/11 157.0
Kootenai USC00108137 2.52 09/22 05/15 149.0
Cascade USC00101514 0.55 09/12 06/08 122.0
Hagerman USC00103932 1.28 09/26 05/08 158.0
Council USC00102187 1.03 09/28 05/16 154.0
Ashton USC00100470 0.41 09/13 06/01 131.0
Grace USC00103732 0.79 09/10 06/05 120.0
Arco USC00100375 0.07 09/15 05/30 129.0
Challis USW00004114 1.50 09/20 05/20 140.0
Cottonwood USC00102159 2.20 10/06 05/15 166.0
Hauser USC00101956 12.45 10/12 04/29 188.0
Teton USC00108818 2.94 09/06 06/05 116.0
Horseshoe Bend USC00101017 12.19 10/05 05/28 157.0
Inkom USC00107208 10.23 09/26 05/25 148.0
Wallace USC00109498 0.18 09/27 05/11 158.0
McCammon USC00105716 0.12 09/18 05/31 131.0
Oakley USC00106542 1.04 09/26 05/23 149.0
Hazelton USC00104140 0.10 09/29 05/13 158.0
Potlatch USC00107301 3.37 09/12 05/23 136.0
Greenleaf USC00104318 6.93 10/03 04/29 176.0
Arbon Valley USW00024156 3.70 09/12 06/02 128.0
Athol USC00100667 7.23 09/15 05/28 132.0
Menan USC00107689 4.95 09/30 05/15 156.0
Smelterville USC00104831 2.84 09/19 05/21 140.0
Ririe USC00107689 7.59 09/30 05/15 156.0
Carey USC00107040 6.13 09/03 06/22 93.0
Mullan USC00106230 0.53 09/23 05/23 149.0
Hayden Lake USC00101956 5.61 10/12 04/29 188.0
Notus USC00106844 8.89 10/04 05/01 173.0
Melba USC00108928 11.85 10/21 04/22 205.0
Roberts USC00107689 11.11 09/30 05/15 156.0
Silverton USC00109498 1.63 09/27 05/11 158.0
Letha USC00102942 9.44 10/11 05/07 176.0
Downey USC00102667 0.17 09/12 06/07 119.0
Clark Fork USC00101363 6.81 10/02 05/15 162.0
Kooskia USC00105013 5.23 10/04 05/05 171.0
Weston USC00107346 6.31 09/23 05/24 143.0
Paris USC00100803 7.52 08/29 06/25 86.0
Firth USC00100915 11.33 09/28 05/11 157.0
Dayton USC00107346 5.86 09/23 05/24 143.0
Idaho City USC00104442 0.69 09/01 06/24 90.0
Deary USC00102892 17.85 09/16 05/22 137.0
Pierce USC00107046 0.11 09/01 06/12 103.0
Dubois USC00102707 4.89 09/24 05/27 141.0
Georgetown USC00100803 10.18 08/29 06/25 86.0
Fairfield USC00103108 0.27 09/07 06/17 108.0
Craigmont USC00109846 7.47 09/17 06/01 132.0
Nezperce USC00106424 0.21 09/12 06/03 127.0
Mackay USC00105462 0.24 09/13 06/09 118.0
Richfield USC00107673 0.22 09/20 06/01 132.0
Grand View USC00103760 4.65 10/01 05/03 171.0
Clifton USC00107346 9.27 09/23 05/24 143.0
Lewisville USC00107689 5.08 09/30 05/15 156.0
Blanchard USC00100667 19.79 09/15 05/28 132.0
Culdesac USC00109846 9.78 09/17 06/01 132.0
Weippe USC00107046 10.36 09/01 06/12 103.0
Garden Valley USC00103448 0.98 09/04 06/10 111.0
Eden USC00104140 3.76 09/29 05/13 158.0
Riggins USC00107706 5.94 10/02 05/12 164.0
Lava Hot Springs USC00105143 0.22 09/13 05/31 129.0
Basalt USC00100915 12.49 09/28 05/11 157.0
Winchester USC00109846 0.23 09/17 06/01 132.0
Declo USW00024133 7.21 09/29 05/12 159.0
Cambridge USC00101408 0.06 09/21 05/22 143.0
Mud Lake USC00103964 13.64 09/06 06/12 108.0
Arimo USC00105716 6.48 09/18 05/31 131.0
Newdale USC00108022 5.95 09/15 05/25 137.0
Yellow Pine USC00109950 0.15 09/05 06/21 100.0
Gannett USC00107040 6.53 09/03 06/22 93.0
Bancroft USC00105143 9.29 09/13 05/31 129.0
Rockford Bay USC00101956 12.79 10/12 04/29 188.0
Dietrich USC00108380 7.93 10/10 05/01 182.0
Parker USC00108022 3.96 09/15 05/25 137.0
Laclede USC00108137 12.36 09/22 05/15 149.0
Tetonia USC00102676 6.27 09/02 06/20 95.0
Bliss USC00103932 8.08 09/26 05/08 158.0
Hollister USW00094178 9.96 09/28 05/15 156.0
Rockland USC00105678 8.99 09/19 05/28 136.0
Donnelly USC00105708 10.89 08/28 06/29 82.0
Hammett USC00103631 7.25 09/26 05/06 164.0
Oldtown USC00107386 15.12 09/07 05/27 125.0
Worley USC00107188 6.44 09/29 05/21 155.0
Albion USC00105567 12.98 09/06 06/13 106.0
East Hope USC00108137 12.82 09/22 05/15 149.0
Castleford USC00101551 2.08 09/22 05/25 142.0
Harrison USC00107188 12.67 09/29 05/21 155.0
Midvale USC00101408 7.63 09/21 05/22 143.0
Bloomington USC00105275 6.78 09/15 05/27 132.0
Onaway USC00107301 2.79 09/12 05/23 136.0
Wardner USC00104831 0.95 09/19 05/21 140.0
Rockford USC00100915 9.54 09/28 05/11 157.0
Bovill USC00102892 11.41 09/16 05/22 137.0
Stites USC00105013 2.47 10/04 05/05 171.0
St. Charles USC00105275 3.92 09/15 05/27 132.0
Crouch USC00103448 0.98 09/04 06/10 111.0
Malta USC00105567 0.02 09/06 06/13 106.0
Moore USC00100375 7.68 09/15 05/30 129.0
Murphy USC00108928 8.90 10/21 04/22 205.0
Sweetwater USW00024149 10.62 10/18 04/14 211.0
Peck USC00102845 5.23 10/12 04/27 192.0
Fernan Lake Village USC00101956 2.45 10/12 04/29 188.0
Princeton USC00107301 3.38 09/12 05/23 136.0
Fernwood USC00108062 16.59 09/27 05/10 161.0
Elk River USC00102892 0.09 09/16 05/22 137.0
Bennington USC00100803 5.03 08/29 06/25 86.0
Ferdinand USC00102159 8.21 10/06 05/15 166.0
Acequia USC00105980 4.85 09/24 05/24 146.0
Conkling Park USC00108062 10.34 09/27 05/10 161.0
De Smet USC00107188 11.49 09/29 05/21 155.0
Murtaugh USC00104140 7.35 09/29 05/13 158.0
Hope USC00108137 12.19 09/22 05/15 149.0
Huetter USC00101956 2.90 10/12 04/29 188.0
Tensed USC00107188 10.56 09/29 05/21 155.0
Minidoka USC00105980 5.35 09/24 05/24 146.0
White Bird USC00103771 15.36 09/26 05/15 155.0
Butte City USC00100375 3.58 09/15 05/30 129.0
Smiths Ferry USC00106586 13.02 09/10 06/08 121.0
Placerville USC00104442 9.25 09/01 06/24 90.0
Parkline USC00108062 5.31 09/27 05/10 161.0
Reubens USC00109846 7.02 09/17 06/01 132.0
Oxford USC00102667 12.72 09/12 06/07 119.0
Bruneau USC00101195 0.14 10/10 04/26 190.0
Hamer USC00103964 3.97 09/06 06/12 108.0
State Line USC00101956 11.33 10/12 04/29 188.0
Spencer USC00102707 8.11 09/24 05/27 141.0
Lowman USC00105414 0.13 08/29 06/16 98.0
Atomic City USW00094143 8.84 09/01 06/20 99.0
Drummond USC00100470 7.45 09/13 06/01 131.0
Clayton USW00004114 20.41 09/20 05/20 140.0
Lost River USC00105462 15.30 09/13 06/09 118.0
Coolin USC00107386 8.91 09/07 05/27 125.0
Banks USC00103448 7.81 09/04 06/10 111.0

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