Photo: Tommyers89 · CC BY-SA 4.0Twin Falls’ winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 90°, a January night drops to 22°, and about 24 inches of snow falls in a normal winter.
A year in Twin Falls at a glance
Each month’s typical high and low, and what it brings.
What stands out about Twin Falls’ climate
Compared with towns across the U.S., with Twin Falls’ place in Idaho beside it.
What a year in Twin Falls feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 9. Frost and day counts come from NOAA’s station at Twin Falls-kmvt, ID, 1.2 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Twin Falls’ center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 0°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 24 inches of snow a winter
Snow, measured at Twin Falls 6 E, ID, falls mostly in January. Precipitation (rain plus melted snow) adds up to 10 inches a year; May is the wettest month and July the driest. Rain or snow falls on about 86 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Twin Falls
88% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Twin Falls-kmvt, ID.
Living with Twin Falls’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 6b. The last frost comes by Apr 30 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 9.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 7.9 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Twin Falls from natural hazards, river flooding is the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 28%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Twin Falls and similar climates
TownRatings has no climate map of the towns around Twin Falls yet.
Climates most like Twin Falls’, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Twin Falls, ID | 22° | 90° | 10" | 24" |
| Gardnerville Ranchos, NV | 23° | 90° | 11" | 22" |
| Bluffdale, UT | 21° | 92° | 13" | 26" |
| Terrace Heights, WA | 25° | 89° | 9" | 20" |
| Snowflake, AZ | 20° | 90° | 10" | 13" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Twin Falls averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.0°).
A smaller shift than in 55% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Twin Falls compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Twin Falls’ place among Idaho’s.
Twin Falls weather by month
Highs, lows and precipitation from NOAA’s grid at Twin Falls’ center; snow, wet days and snow on the ground from Twin Falls 6 E, ID. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 39° | 22° | 1.1" | 7.8" | 11 | 21° – 37° |
| February | 44° | 24° | 0.8" | 5.5" | 9 | 26° – 42° |
| March | 54° | 30° | 1.0" | 1.9" | 9 | 37° – 48° |
| April | 61° | 35° | 1.0" | 0.5" | 10 | 43° – 53° |
| May | 71° | 43° | 1.3" | 0.0" | 9 | 50° – 63° |
| June | 80° | 50° | 0.7" | 0.0" | 7 | 60° – 73° |
| July | 90° | 57° | 0.2" | 0.0" | 3 | 64° – 78° |
| August | 88° | 55° | 0.3" | 0.0" | 3 | 66° – 75° |
| September | 78° | 46° | 0.5" | 0.0" | 3 | 59° – 66° |
| October | 64° | 36° | 0.8" | 0.5" | 5 | 42° – 57° |
| November | 49° | 27° | 0.9" | 2.0" | 8 | 31° – 45° |
| December | 39° | 21° | 1.3" | 6.0" | 10 | 25° – 36° |
| Year | 63° | 37° | 9.9" | 24.2" | 86 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 26° to 42°. September is the most reliable, staying within 7°.
Where Twin Falls’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Twin Falls’ center.
- Snow: Twin Falls 6 E, ID.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Twin Falls-kmvt, ID, 1.2 miles from the city’s center point, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Twin Falls’ climate
What is the weather like in Twin Falls?
A typical July afternoon reaches 90°, a January night drops to 22°, and about 24 inches of snow falls in a normal winter. Colder January nights than 51% of U.S. towns; hotter July afternoons than 79% of U.S. towns.
How cold does it get in Twin Falls in winter?
December nights average 21°. About 140 nights a year reach 32° or below and 1 reach 0° or below. In the coldest December of the last 30 years the month averaged 25°.
How much snow does Twin Falls get?
About 24 inches in a normal winter at Twin Falls 6 E, ID, most of it in January.
How hot does it get in Twin Falls?
July, with a typical high of 90° and a low of 57°. About 46 days a year reach 90° and 5 reach 100° (Twin Falls-kmvt, ID).
When is the first and last frost in Twin Falls?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 9, about 161 frost-free days, at Twin Falls-kmvt, ID.
What growing zone is Twin Falls in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 0°.
What is the best time of year to visit Twin Falls?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Twin Falls getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 55% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Twin Falls.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.