AMBLEWAY Wildest hikes

Blithedale Summit Open Space Preserve

H Line Fire Road–Old Railroad Grade Fire Road, 3 sights

2.3 mi · ▲ 574 ft · 1 hr 3 min

H Line Fire Road–Old Railroad Grade Fire Road, 3 sights is a 2.3-mile out-and-back in Blithedale Summit Open Space Preserve near Mill Valley, CA. It climbs 574 ft, with sections as steep as 23% grade, and is mostly gravel. It scores 47/100 on the Ambleway Wildness scale: green fringe.

Elevation

0 mi213 – 663 ft · steepest grade: 23%2.4 mi

Getting there

Trailhead: Old Railroad Grade Fire Road 37.92105, -122.55544
Nearest town Mill Valley, CA
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Directions

AMBLEWAYwww.ambleway.com

H Line Fire Road–Old Railroad Grade Fire Road, 3 sights

2.3 mi · ▲ 574 ft · 1 hr 3 min

Elevation 215–664 ft

Out & Back · Blithedale Summit Open Space Preserve

Trailhead: Old Railroad Grade Fire Road · 37.92105, -122.55544

Weather Aug 3: Clear, high 95°F / low 64° · precip 0% · wind 5 mph · sunrise 6:16 AM · sunset 8:18 PM

  1. Start on Old Railroad Grade Fire Road, heading N.
  2. 0.1 miSharp right onto H Line Fire Road, heading SE.
  3. 0.6 miTurn left onto Blithedale Ridge Fire Road, heading NW.
  4. 100 ftContinue straight onto H Line Fire Road, heading NW.
  5. 0.2 miBear left onto Southern Marin Line Road, heading SE.
  6. 100 ftContinue straight onto H Line Fire Road, heading SE.
  7. 50 ftTurn right onto Southern Marin Line Road, heading SE.
  8. 0.2 miReach Old Railroad Grade Fire Road, then turn around and head back the way you came.
  9. 0.2 miTurn left onto H Line Fire Road, heading NW.
  10. 50 ftContinue straight onto Southern Marin Line Road, heading N.
  11. 100 ftBear right onto H Line Fire Road, heading N.
  12. 0.2 miContinue straight onto Blithedale Ridge Fire Road, heading NW.
  13. 100 ftTurn right onto H Line Fire Road, heading S.
  14. 0.6 miSharp left onto Old Railroad Grade Fire Road, heading SE.
  15. 0.1 miArrive back at the trailhead.

Each distance is the walk from the previous step. Tap a step for a map of its junction.

Trail map, photos and weather for this hike: www.ambleway.com/hikes/h-line-fire-road-old-railroad-grade-fire-road-out-back-3-sights-4-km

Trail surface

83% gravel2% dirt15% unspecified

Weather

ClearTemperature 95°F64°
Feels like82°Precip0%Wind5 mphUV8Humidity30%
Hourly temperature
95°60°
Sunrise 6:16 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:18 PM
Tue 87°69°
Wed 83°54°
Thu 70°52°
Fri 73°50°
Sat 73°50°
Sun 66°50°

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