Saddle Road to Mauna Kea Access Road
Summit drive to Pacific's highest peak
The Mauna Kea Access Road climbs from 6,500 feet at Saddle Road through the Mauna Kea State Recreation Area to the 13,796-foot summit, passing through distinct ecological zones from tropical scrubland to alpine desert. The paved road becomes graded cinder at Onizuka Center for International Astronomy around 9,200 feet, where most rental cars turn back due to insurance restrictions. The final 4.5 miles to the summit pass through otherworldly red cinder fields that NASA uses for Mars rover testing.
This moderate route requires 4WD for the upper section and decent ground clearance for loose volcanic cinder. Weather can shift rapidly from clear to whiteout conditions above treeline, and altitude sickness affects some visitors. Best driven in dry conditions April through October, though snow can occur year-round above 12,000 feet. The payoff is world-class stargazing at Lake Waiau and standing atop the Pacific’s highest peak among billion-dollar telescopes.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | High Clearance |
| Surface | Gravel |
| Features | High Altitude, Remote, Scenic |
| Length (miles) | 15 mi / 24.1 km |
| Duration | Half day |
| Max elevation (ft) | 13796 ft |
| Best season | April-October |
| Minimum vehicle | 4WD high-clearance |
| Nearest town | Hilo, Hawaii |
| Land manager | University of Hawaii |
| Permit required | No |
| Cell service | Spotty |
| Water crossings | No |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock 4Runner make it to the Mauna Kea summit?
Yes, but barely. You need 4WD and high clearance for the upper section past the visitor center. Stock clearance works but you'll scrape on some rocks.
Is the summit road open year-round?
No, it closes frequently in winter due to snow and ice above 9,200 feet. Best access is April through October when weather conditions are most stable.
Do I need permits to drive to the Mauna Kea summit?
No permits required for driving, but the road is managed by University of Hawaii. Commercial tours need special permits but recreational vehicles can access freely.
What's the hardest part of this drive?
The final 4.5 miles above the visitor center - loose cinder, steep grades, and thin air at 13,000+ feet. Your engine will lose significant power due to altitude.
Should I fill up with gas before attempting this trail?
Absolutely. Nearest gas is in Hilo, 45+ miles away, and your engine burns more fuel fighting altitude and steep grades. Top off your tank before starting.