Hash Boulder–Parking Lot Rock, 4 rocks is a 1.8-mile out-and-back in Castle Rock State Park near San Lorenzo Park, CA. The route passes Lyme Disease Rock and Parking Lot Rock before reaching Hash Boulder at the turnaround, 0.9 miles in. It climbs 361 ft, with sections as steep as 18% grade. It scores 1/100 on the Ambleway Wildness scale: paved and peopled.
Elevation
0 mi3,002 – 3,153 ft · steepest grade: 18%1.9 mi
Getting there
Trailhead: Skyline Trail 37.23017, -122.09372
Nearest town San Lorenzo Park, CA
Directions
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Hash Boulder–Parking Lot Rock, 4 rocks
1.8 mi · ▲ 361 ft · 47 min
Elevation 3,001–3,154 ft
Out & Back · Castle Rock State Park
Trailhead: Skyline Trail · 37.23017, -122.09372
Weather Aug 3: Clear, high 86°F / low 70° · precip 0% · wind 4 mph · sunrise 6:15 AM · sunset 8:15 PM
Toilets at the trailhead · Parking lot at the trailhead
- Start on Skyline Trail, heading SE.
- 0.4 miTurn right, heading W.
- 50 ftPass Lyme Disease Rock.
- 0.2 miContinue straight onto Castle Rock Trail, heading NW.
- 0.2 miPass Parking Lot Rock.
- 50 ftBear right, heading N.
- 100 ftSharp right, heading N.
- 50 ftTurn left, heading N.
- 350 ftReach Hash Boulder, then turn around and head back the way you came.
- 400 ftTurn right, heading S.
- 50 ftBear right, heading S.
- 0.4 miTurn left onto Skyline Trail, heading SE.
- 0.4 miArrive back at the trailhead.
Each distance is the walk from the previous step. Tap a step for a map of its junction.
Trail surface
51% dirt49% unspecified
Weather
ClearTemperature 86°F70°
Precip0%Wind4 mphUV8Humidity33%
Hourly temperature
90°70°
Sunrise 6:15 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:15 PM
Tue
84°65°
Wed
81°49°
Thu
92°49°
Fri
98°56°
Sat
96°58°
Sun
91°50°
Sunset
The best sunset spot on this hike is right at the trailhead, so there is no walk out. Be there by 7:55 PM to have the sun's last 20 minutes of sky before it sets at 8:15 PM. Your car is right there — dark at 8:44 PM.
Good to know
- Toilets at the trailhead
- Parking lot at the trailhead
Other ways to reach this destination
More from Skyline Trail Trailhead
- Castle Rock–Balancing Rock, 4 cliffs 1.5 mi · ▲ 212 ft
- Ridge Trail & Saratoga Gap Trail 2.1 mi · ▲ 446 ft
- Parking Lot Rock–Ridge Trail, 3 sights 2.5 mi · ▲ 588 ft
- Castle Rock Falls–Saratoga Gap Viewpoint, 5 cliffs 2.9 mi · ▲ 738 ft
- Shady Rock–Platypus, 6 rocks 3.4 mi · ▲ 869 ft
- Lyme Disease Rock via Skyline Trail 4.9 mi · ▲ 722 ft
Get outside more
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Hikes near San Lorenzo Park, California