Out on the west side of Donner Pass, about 17 miles west of Truckee near Big Bend, Rainbow is a compact granite boulderfield cut from the same clean, crystalline Sierra rock that made Donner Summit famous. Think white slabs and small dome-like blocks, thin edges and crystals, and footwork that actually counts. The approach is short and the landings are mostly flat, which doesn't happen together as often as you'd like. If you're already up in North Tahoe, it's an easy day. This guide is part of a bigger Lake Tahoe bouldering guide.
Where it is & getting there
Rainbow sits just off Interstate 80 at exit 168 (Big Bend / Rainbow Rd), out near Big Bend and Cisco Grove, roughly 17 miles west of Truckee. From the exit, head south about a mile and park at the roadside Loch Leven Trail pullout by the Big Bend Fire Station / Ranger Station. The trail kicks off behind a storage shed across from the ranger station and winds about 10 minutes through manzanita to the boulders. You're at roughly 5,800 feet up here. 📍 Open in Google Maps.
Heads-up: this is Tahoe National Forest, but there's private property just west of the crag, so stay along the base of the boulders and don't cut through it. Park fully off the road at the pullout.
When it's in
Spring and fall, with fall (September–November) serving up the crispest temps and the best friction. Rainbow is west-facing, so you get morning shade and afternoon sun. That's handy on a cool day and something to plan around when it's warm. At ~5,800 feet it buries under snow all winter, so treat it as a spring-through-fall spot.
The rock
Clean Sierra granite: white slabs and small dome-like blocks studded with thin edges, crimps, crystals, and aretes. It pays off precise footwork and trusting your feet on smears, then throws powerful moves at you on the steeper faces. If you've spent time at Donner Summit, Rainbow will feel like home.
Classic problems, V2 to V10
Here's a ladder through the area's classics, low to high. Grades are community consensus, so they'll feel stiff some days and soft others. Tap MP / Kaya for beta, and the coordinates to drop a pin right on the boulder:
| Problem | Grade | What it is | Beta | Location |
|---|---|---|---|---|
| Domino Effect | V2 | A friendly warm-up on the Trigantor boulder | MP | 39.3089, -120.51382 |
| Sweet Leaf | V3 | A clean granite moderate | MP | 39.30792, -120.51644 |
| Masterwork | V4 | A great line on the Trigantor boulder, with a spooky topout | MP · Kaya | 39.3089, -120.51382 |
| Wein's Law | V4 | A solid moderate on the Rainbow C boulders | MP · Kaya | 39.31118, -120.51551 |
| Resolution | V4 | Sit start on a sloping shelf, crimps to a jug (Rainbow B) | MP · Kaya | 39.31044, -120.51572 |
| Prism | V5 | A crimpy granite classic | MP · Kaya | 39.31044, -120.51572 |
| Triple Crown | V6 | A step-up on the Trigantor boulder | MP · Kaya | 39.3089, -120.51382 |
| Ginja Ninja | V6 | A well-traveled Rainbow V6 | MP · Kaya | 39.30887, -120.51262 |
| Rain Fly | V7 | A Rainbow A classic | MP · Kaya | 39.31004, -120.51537 |
| Rainbird | V7-8 | A powerful Rainbow A line | MP · Kaya | 39.31004, -120.51537 |
| A Firm Resolve | V10 | The area's hard testpiece | MP | 39.31127, -120.51559 |
Grades and coordinates from Mountain Project; problems on the same boulder share coordinates (Trigantor and Rainbow A). Kaya grades Masterwork V3 and Rainbird V8. Check conditions before you go.
What to bring
- Crash pads. The landings are mostly flat, but cover the gaps and bring a spotter.
- Stiff, edgy shoes. You'll be standing on crimps and smearing up slabs.
- Dry chalk. Here's our take on chalk, and pure Pow Day holds up on granite friction.
- A brush for the crystalline, popular holds. (How to brush a hold the right way.)
- A bucket that survives the trail. The Bolder Chalk Bucket keeps your chalk and brush in reach.
Leave No Trace at Rainbow
Rainbow sits on Forest land with private property right next door, so the usual rules matter a little more here:
- Park fully off the road at the pullout near the ranger station.
- Stay on the manzanita trail, and don't trespass on the private property west of the crag.
- Pad the landings and put out spotters.
- Brush off your chalk and tick marks before you leave.
- Respect any seasonal restrictions posted at the Big Bend Ranger Station.
FAQ
Where is Rainbow bouldering? It's on the west side of Donner Pass near Big Bend, about 17 miles west of Truckee, off Interstate 80 at exit 168. Park at the Loch Leven Trail pullout by the Big Bend Ranger Station.
Is Rainbow good for beginners? It skews a little harder overall, but there are approachable moderates (Domino Effect V2, Sweet Leaf V3, Masterwork V4) sitting right next to the stiff testpieces, and the short approach and flat landings make it beginner-friendly.
When is the best season for Rainbow? Spring through fall, and fall gives you the best friction. It's west-facing and sits at ~5,800 feet, so it snows in over winter.
Do I need a permit? No bouldering permit is noted for the area; it's Tahoe National Forest land. Just park legally and steer clear of the private property to the west.
Do I need a rope? Nope, it's bouldering: pads, shoes, chalk, and a brush. There are roped granite slabs nearby if you bring a rack.
Rainbow is an easy add to a Truckee or Donner day: clean granite, a short walk, and a full spread of grades. For the bigger picture, see the Lake Tahoe bouldering guide, and brush up on keeping the rock clean before you go.