Question 1

Are dogs allowed at Ring Mountain?

Accepted Answer

Yes, on-leash only (6-foot maximum). Ring Mountain Open Space Preserve (Marin County Open Space District) allows leashed dogs on all trails. Maximum 3 dogs per person. No commercial dog walking is permitted. No off-leash areas exist anywhere in the preserve.

Question 2

How difficult is Ring Mountain for dogs?

Accepted Answer

Ring Mountain has two main route options: the Phyllis Ellman Loop (1.76 miles, moderate) and the Ring Mountain Loop (2.9 miles, 626 feet elevation gain, more challenging). The terrain includes steep rocky sections with exposed serpentine rock outcroppings. Dogs with good fitness handle it well; senior dogs with joint issues may struggle on the rocky summit sections.

Question 3

Is there water on the Ring Mountain trail?

Accepted Answer

No water sources exist anywhere on the Ring Mountain trail. Bring at least 2–3 liters of water per dog for the full loop. The exposed rocky summit has no shade and can be significantly hotter than the trailhead on clear days. A collapsible bowl is essential.

Question 4

How bad is the poison oak at Ring Mountain?

Accepted Answer

Poison oak is significant — especially during the first 20 minutes of the trail from the trailhead. The trail edges are dense with poison oak shrubs in the lower chaparral sections. Long-haired dogs may transfer urushiol oil (the allergen) to owners after brushing through it. Rinse dogs with dish soap and water after visits during leafed-out seasons (spring–fall). Learn to identify poison oak (three-leaflet shiny leaves, red in fall).

Question 5

What is the Tiburon Mariposa Lily at Ring Mountain?

Accepted Answer

Ring Mountain is one of only two locations in the world where the Tiburon Mariposa Lily (Calochortus tiburonensis) grows — it is federally threatened and found nowhere else on Earth except this serpentine ridge. The lily blooms in late May to early June. Stay strictly on trail and keep dogs on leash to avoid trampling this rare plant.

Question 6

Are there petroglyphs at Ring Mountain?

Accepted Answer

Yes. Ancient Native American petroglyphs (rock carvings) are located on serpentine rock outcroppings near the Ring Mountain summit. The petroglyphs are believed to be from the Coast Miwok people. The carvings are on the rocks and not easily visible — ask a ranger about their location. Keep dogs away from the carved rocks.

Question 7

What is the best time to visit Ring Mountain with a dog?

Accepted Answer

Fall (October–November) and winter (December–February) are ideal — lower poison oak density (deciduous in winter), cooler temperatures, no ticks (relatively), and fewer visitors. Spring (March–April) brings wildflowers including the rare Tiburon Mariposa Lily in May. Avoid summer afternoons — the exposed rock summit becomes extremely hot.

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