Next 7 departures
- SatOct 3
ClearNo significant weather expected. Temperatures 53–68°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Partly sunny64°F Ogden7:30 AM MDT Partly sunny62°F Sweetzer Summit9 AM MDT Mostly sunny53°F Jerome10 AM MDT Mostly sunny61°F Mountain Home11 AM MDT Mostly sunny68°F Boise11:45 AM MDT Mostly sunny68°F - SunOct 4
ClearNo significant weather expected. Temperatures 55–70°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Mostly sunny61°F Ogden7:30 AM MDT Mostly sunny60°F Sweetzer Summit9 AM MDT Mostly sunny55°F Jerome10 AM MDT Sunny61°F Mountain Home11 AM MDT Sunny70°F Boise11:45 AM MDT Sunny70°F - MonOct 5
ClearNo significant weather expected. Temperatures 58–72°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Mostly sunny66°F Ogden7:30 AM MDT Mostly sunny62°F Sweetzer Summit9 AM MDT Partly sunny58°F Jerome10 AM MDT Partly sunny65°F Mountain Home11 AM MDT Partly sunny72°F Boise11:45 AM MDT Partly sunny72°F - TueOct 6
ClearNo significant weather expected. Temperatures 58–72°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Mostly sunny64°F Ogden7:30 AM MDT Mostly sunny62°F Sweetzer Summit9 AM MDT Sunny58°F Jerome10 AM MDT Sunny64°F Mountain Home11 AM MDT Sunny72°F Boise11:45 AM MDT Sunny71°F - WedOct 7
ClearNo significant weather expected. Temperatures 56–71°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Sunny62°F Ogden7:30 AM MDT Sunny60°F Sweetzer Summit9 AM MDT Sunny56°F Jerome10 AM MDT Sunny62°F Mountain Home11 AM MDT Sunny71°F Boise11:45 AM MDT Mostly sunny71°F - ThuOct 8
ClearNo significant weather expected. Temperatures 56–71°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Sunny61°F Ogden7:30 AM MDT Sunny59°F Sweetzer Summit9 AM MDT Sunny56°F Jerome10 AM MDT Sunny62°F Mountain Home11 AM MDT Sunny71°F Boise11:45 AM MDT Mostly sunny71°F - FriOct 9
ClearNo significant weather expected. Temperatures 55–72°F along the way.
Along the way
Checkpoint · arrival Weather · temperature Salt Lake City7 AM MDT Mostly sunny60°F Ogden7:30 AM MDT Mostly sunny59°F Sweetzer Summit9 AM MDT Mostly sunny55°F Jerome10 AM MDT Mostly sunny63°F Mountain Home11 AM MDT Mostly sunny72°F Boise11:45 AM MDT Mostly sunny71°F
The worst conditions expected at any checkpoint, timed to when you would reach it driving without stops. Levels use Road Travel’s driving-risk scale.
The route, stop by stop
Checkpoints in order, with driving time from Salt Lake City (no stops) and elevation. The forecast above is timed to these.
- Salt Lake City, UTStart 4,264 ftelevation
- Ogden, UTMile 36 · 35 min 4,302 ftelevation
- Sweetzer Summit, IDMountain pass · Mile 133 · 1 h 53 min 5,528 ftelevation
- Jerome, IDMile 225 · 3 h 7 min 3,765 ftelevation
- Mountain Home, IDMile 296 · 4 h 3 min 3,143 ftelevation
- Boise, IDMile 340 · 4 h 42 min 2,707 ftelevation
Typical weather by month
Average daily highs and lows, and days with an inch or more of snow, at Salt Lake City, Sweetzer Summit and Boise.
| Month | Salt Lake City 4,225 ft | Sweetzer Summit Malta station · 4,590 ft | Boise 2,814 ft | ||
|---|---|---|---|---|---|
| High / low °F | Snow days | High / low °F | High / low °F | Snow days | |
| Jan | 39° / 24° | 3.6 | 38° / 18° | 39° / 26° | 1.8 |
| Feb | 45° / 29° | 3.0 | 44° / 21° | 46° / 29° | 1.2 |
| Mar | 55° / 36° | 2.3 | 54° / 26° | 56° / 35° | 0.5 |
| Apr | 62° / 42° | 1.0 | 62° / 32° | 62° / 40° | 0 |
| May | 73° / 50° | 0 | 70° / 38° | 72° / 48° | 0 |
| Jun | 84° / 59° | 0 | 81° / 43° | 81° / 54° | 0 |
| Jul | 94° / 68° | 0 | 90° / 50° | 93° / 62° | 0 |
| Aug | 92° / 67° | 0 | 89° / 49° | 91° / 61° | 0 |
| Sep | 81° / 56° | 0 | 80° / 41° | 80° / 53° | 0 |
| Oct | 66° / 44° | 0.3 | 65° / 33° | 65° / 42° | 0.1 |
| Nov | 51° / 33° | 2.1 | 49° / 23° | 49° / 32° | 0.8 |
| Dec | 39° / 25° | 3.8 | 39° / 18° | 39° / 25° | 1.7 |
NOAA NCEI U.S. Climate Normals, 1991–2020: SALT LAKE CITY INTL AP (USW00024127, 4,225 ft); MALTA 4 ESE (USC00105563, 4,590 ft); BOISE AIR TERMINAL (USW00024131, 2,814 ft). Snow days are days with at least 1 inch of new snow. “—” means the station does not publish that normal.
Road conditions
Closures and chain rules change by the hour, so we link to the official reports for Utah and Idaho rather than repeat them.
- Utah · UDOTUDOT Traffic road conditions
- Utah · winter rulesTraction law summary
- Idaho · ITD511 Idaho road conditions
Check the official National Weather Service forecast and each state's road report before you leave.
Get alerts timed to where you’ll be when you get there
Road Travel plans the drive from Salt Lake City to Boise with the forecast at every stretch for the hour you’ll reach it, then warns you about weather ahead while you drive.
Questions about this drive
How long is the drive from Salt Lake City to Boise?
340 miles, about 4½ hours of driving without stops, by way of I-15 and I-84. Fuel, food and rest stops add to that.
What is the highest point on the drive?
Sweetzer Summit, at 5,528 ft. It comes at mile 133, about 1 h 53 min of driving after you leave Salt Lake City.
How cold is Sweetzer Summit in January?
The nearest long-term NOAA station, Malta (4,590 ft), averages a high of 38°F and a low of 18°F in January (1991–2020 normals).
How cold is Boise in January?
Boise averages a high of 39°F and a low of 26°F in January (1991–2020 normals).