SAN FRANCISCO (KPIX) -- A freeze warning was issued for late Thursday night through mid-Friday morning for part of the North Bay, according to the National Weather Service.
Weather officials said temperatures may drop to the mid 20s. Isolated areas may see temperatures in the low 20s.
Despite the cold, people came out to dine at restaurants open in downtown Healdsburg Thanksgiving night. Healdsburg was the coldest spot in the North Bay, with temperatures dipping to just 30 degrees overnight.
Inside Spoonbar some cozy diners celebrated the holiday with bottles of wine and Thanksgiving cuisine. Others made their holiday memories outdoors.
"We really wanted to see these beautiful lights and take pictures before everyone has to go home," said Kristin Brunkow of Healdsburg.
The National Weather Service is warning that the frost and freeze conditions could kill crops and sensitive plants and possibly damage unprotected plumbing.
"My mom has some lovely tomato plants outside that we might need to cover up because, if it's getting cold, they're not going to do too well," said Ben Zigler of Healdsburg.
Thursday's freeze warning remains in effect until 9 a.m. Friday.
The freezing temperatures have replaced the extreme winds that fanned the Kincade Fire last month. Healdsburg, was one of the cities threatened by the fire.
"We had to evacuate but everything was good," said Mau Rodriguez of Santa Rosa.
Rodriguez is glad his home was not damaged.
"I used to live in the Northeast so I'll take this two or three times rather than being in New York," he said.
Sonoma County says it plans to open warming centers Dec. 1.
In addition, a frost advisory was issued for parts of the East Bay and South Bay. The advisory goes into effect at 10 p.m. Thanksgiving Day and lasts until 9 a.m. Friday for areas around Concord, Livermore, San Jose and Gilroy.
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