Friday is expected to bring dangerously icy conditions to higher elevation areas around the Bay.
Forecasters predict freezing temperatures and even snow on Mount Tamalpais by Friday night.
Many hikers out Friday afternoon said the temperatures were plummeting.
“It was a little chilly to start with, not too bad once I got started up hill it was pretty warm actually,” said Brian Mikesell as he hiked near the Pan Toll campground.
Despite the frigid weather, many are planning to be out on Mount Tamalpais Saturday at 5 a.m. for the North Face Endurance Challenge.
Monica Morant, 42, of Los Angeles says she’s trying to figure out what to wear to stay warm during the 50-mile footrace.
“I’ve trained in a little bit of cold, not quite this cold for this long, but as long as it doesn’t rain like last year,” said Morant.
For many Bay Area residents it’s a tradition for folks to drive up to Mount Tamalpais to enjoy the snow, but rangers are warning folks to prepare for disappointment.
“If at any point it starts snowing on Mount Tamalpais we would probably close the roads down,” said State Park Ranger Cecilia Rejas.
Those twisty roads, snow and black ice can be treacherous, even vehicles equipped with 4-wheel drive would be prohibited.