Do I need chains to drive to Tahoe?

Only when Caltrans says so. Chains are required on the roads to Lake Tahoe whenever a chain control (R-1, R-2 or R-3) is in effect on I-80, US-50 or the other passes, usually during and just after a storm. The live status above shows what is posted right now.

The short version

• No chain control posted (R-0): drive normally. Most winter days are like this, even with snow on the ground beside the road.
• R-1 or R-2 posted: you need chains unless your vehicle qualifies for the exemption at that level (snow-tread tires for R-1; 4WD or AWD with snow-tread tires on all four wheels for R-2). Exempt vehicles must still carry chains.
• R-3 posted: every vehicle chains up, no exceptions. In practice Caltrans often closes the highway before it gets that far.

Requirements change without notice as the storm moves, so check again right before you leave and watch the signs on the way up.

What "chains required" means for your car

Caltrans has three chain control levels, and the sign tells you which one is in effect:

• R-1: chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight that have snow-tread tires on at least two drive wheels. Vehicles using snow tires must carry chains.
• R-2: chains or traction devices are required on all vehicles except four-wheel-drive and all-wheel-drive vehicles with snow-tread tires on all four wheels. 4WD and AWD vehicles must still carry chains.
• R-3: chains or traction devices are required on all vehicles, no exceptions.

A snow-tread tire is one marked with the three-peak mountain snowflake symbol or the letters M+S, M/S or MS on the sidewall. Most all-season tires carry an M+S marking, so a Subaru or RAV4 on ordinary all-seasons usually clears R-1 and R-2, but never R-3. The full breakdown is in R-1 vs R-2 vs R-3 explained and chains for AWD, 4WD and snow tires.

Where chain controls start on the way to Tahoe

• I-80 (North Lake Tahoe, Truckee, Reno): controls most often run from Kingvale to the Donner Lake interchange eastbound and from Truckee back to Kingvale westbound. In a big storm the eastbound start point moves lower, to Cisco Grove, Alta or even Colfax. Palisades Tahoe, Northstar, Sugar Bowl and Boreal are all reached this way. See the I-80 page and the Donner Pass guide.
• US-50 (South Lake Tahoe): controls usually begin around Twin Bridges or Strawberry eastbound and at Meyers westbound, covering the climb over Echo Summit. Heavenly and Sierra-at-Tahoe are on this route. See the US-50 page and the Echo Summit guide.
• SR-88 (Kirkwood): Carson Pass is higher than either of the above and holds chain controls longer. See the Highway 88 guide.
• Around the lake: SR-89 between Truckee and Tahoe City and SR-267 over Brockway Summit get their own controls, and SR-89 at Emerald Bay closes in storms.
• From Reno: the Nevada side (Mt. Rose Highway SR-431, US-50 over Spooner Summit) is posted by the Nevada DOT, not Caltrans. Snowy Roads shows those segments too.

When you are most likely to need chains

Chain controls go up when snow is sticking to the pavement and come down once plows and traffic have cleared it, so the risky windows are the storm itself, the night after it, and the early morning when melt refreezes. A sunny afternoon two days after a storm is usually R-0 on the interstate but can still be R-1 on the higher, shadier state routes. If you are heading up for first chair on a powder day, assume controls and leave early.

How to check before you leave

1. Open the Snowy Roads page for your destination, for example Palisades Tahoe, Heavenly or Northstar. Each shows the current level at every Caltrans checkpoint on the way, with cameras and message signs, refreshed every 3 minutes.
2. In the Snowy Roads iOS app, tell it what you drive and it answers "chains required" or "you're exempt, carry them" for your car, and alerts you when that changes.
3. Caltrans QuickMap (quickmap.dot.ca.gov) and the highway information line, 1-800-427-7623, are the official sources.
4. On the road, the sign wins: "Chains Required" plus the level, then a checkpoint about a mile later where CHP or Caltrans checks.

Whatever you drive, always carry chains in winter. Getting turned around at Kingvale on a Saturday morning is the most common way a Tahoe day ends before it starts.