NAPA (CBS SF) — Most wine tasting rooms have reopened in Napa and Sonoma counties following the wildfires this month in the two counties, a winery advocacy group said Eriday.

READ MORE: Wine Country Wildfires

READ MORE: COVID Vaccines: Marin County Set To Expand Eligibility; Seniors Say Finding Appointments Still A Challenge

Fewer than a dozen wineries were destroyed or heavily damaged in the fires and some operated despite the challenging conditions, officials with the Wine Institute said.

Institute officials said except where the fire was the fastest and strongest, the high amount of moisture in the vineyards kept them from burning.

Vineyards in Napa, Sonoma and Mendocino counties represent about 12 percent of wine grape production in California.

Institute officials said because of the heat in late August and early September 90 percent of the 2017 harvest in Napa and Sonoma counties was completed before the fires.

READ MORE: Stunning Yellow Superbloom Pops Up In Half Moon Bay - 'It's Perfect'

Neither smoke nor heat from the fires affected the fermenting of wine or the wine already bottled.

Institute officials said the grapes grown in the 2017 season are excellent and their optimistic the vintage will be as well.

According to the institute, it’s too early to tell what the economic impact of the fires will be on the wine industry. But major damage to vineyards and wineries was not widespread.

Also, operating again is the Napa Valley Wine Train as most of valley was untouched by the fires, company officials said.

MORE NEWS: COVID: Santa Clara Supervisors Approve $5/Hour Grocery Worker Hazard Pay

© Copyright 2017 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed