Tuolumne County Tax Collector Reminds Property Owners - First Installment of County Taxes Becomes Delinquent Wednesday, December 10, 2014 Details Last Updated: Monday, 24 November 2014 04:28 Published: Monday, 24 November 2014 04:26 View Comments November 2014 - The Tax Collector’s office is open weekdays from 8:00 a.m. to 5:00 p.m. Mailed remittance must be postmarked by 12:00 midnight on December 10 to avoid penalties. The Tax Collector cannot extend the time of payment. View the discussion thread. back to top