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 makes Donner Summit famous. Think white slabs and small dome-like blocks, thin edges and crystals, technical footwork — with a short approach and mostly flat landings. If you're up in North Tahoe, it's an easy day. This guide is part of our larger Lake Tahoe bouldering guide.
Where it is & getting there
Rainbow sits just off Interstate 80 at exit 168 (Big Bend / Rainbow Rd), 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 near the Big Bend Fire Station / Ranger Station. The trail starts behind a storage shed across from the ranger station and winds about 10 minutes through manzanita to the boulders. The area sits at roughly 5,800 feet. 📍 Open in Google Maps.
Heads-up: this is Tahoe National Forest, but there's private property just west of the crag — 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) giving the crispest temps and best friction. Rainbow is west-facing, so you get morning shade and afternoon sun — handy on cool days, something to plan around when it's warm. At ~5,800 feet it gets buried in winter snow, so treat it as a spring-through-fall spot.
The rock
Clean Sierra granite: white slabs and small dome-like blocks with thin edges, crimps, crystals, and aretes. It rewards precise footwork and trusting your feet on smears, with powerful moves on the steeper faces. If you've climbed Donner Summit, Rainbow will feel like home.
Classic problems, V2 to V10
A ladder through the area's classics, low to high. Grades are community consensus and can feel stiff or soft on the day. Tap MP / Kaya for beta, and the coordinates to drop a pin 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 — landings are mostly flat, but cover the gaps and bring a spotter.
- Stiff, edgy shoes — you'll be standing on crimps and smearing slabs.
- Dry chalk — our take on chalk, and pure Pow Day for 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
- 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 use 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? 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 leans a little harder overall, but there are approachable moderates (Domino Effect V2, Sweet Leaf V3, Masterwork V4) alongside stiff testpieces, and the short approach and flat landings make it beginner-friendly.
When is the best season for Rainbow? Spring through fall, with fall the best for friction. It's west-facing and sits at ~5,800 feet, so it snows in during winter.
Do I need a permit? No bouldering permit is noted — it's Tahoe National Forest land. Just park legally and steer clear of the private property to the west.
Do I need a rope? No — it's bouldering: pads, shoes, chalk, and a brush. There are roped granite slabs nearby if you bring a rack.
Rainbow is a great add to a Truckee or Donner day — clean granite, a short walk, and a full spread of grades. For the bigger picture, see our Lake Tahoe bouldering guide, and brush up on keeping the rock clean before you go.