When are property taxes due in San Juan County, Washington?

San Juan County property taxes are due April 30. A second installment is due October 31. This deadline applies to all counties in Washington.

What is the penalty for late property tax payment in San Juan County, Washington?

The late payment penalty in San Juan County is 3% June 1, +8% December 1.

How do I pay San Juan County, Washington property taxes?

You can pay San Juan County property taxes by mail to the county treasurer.

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San Juan County Property Tax Due Date

Name: Treasurer
Address: 350 Court Street, Friday Harbor, WA, 98250, US
Telephone: (360) 378-2171

Washington

(360) 378-2171

2026 Property Tax Due Dates

Official Source

Installment 1overdue

April 30

First half

Installment 2in 167 days

October 31

Second half

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Penalty: 3% June 1, +8% December 1Grace period: None

Payment Methods

Online, Mail, In-Person

San Juan County Treasurer

Phone

(360) 378-2171

treasurer@sanjuanco.com

Office Address

350 Court Street
Friday Harbor, WA 98250

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Mailing Address

P.O. Box 639, Friday Harbor, WA 98250

Office Hours

Mon-Fri 8:30am - 4:30pm

How to Pay

Online

Pay using credit card or e-check

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By Mail

Mail check payable to San Juan County Treasurer — P.O. Box 639, Friday Harbor, WA 98250

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In Person

Visit the Treasurer's office — 350 Court Street, Friday Harbor WA 98250, Mon-Fri 8:30am - 4:30pm

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About Property Taxes in Washington

Washington State property taxes are administered at the county level. Property is assessed at 100% of its true and fair market value as of January 1. Washington levies both a state property tax (used for schools) and local taxes (county, city, school district, fire district, and others). The combined rates vary significantly by county. Washington's property tax system has strong protections for seniors and low-income homeowners, including an exemption that reduces or eliminates taxes for qualifying households regardless of property value.

Payment & Assessment

Washington property taxes are paid in two equal installments: First half: Due April 30 Second half: Due October 31 If the total tax is under $50, the full amount is due April 30. An interest charge of 12% per year applies to late payments, plus a 3% penalty on the first half and 8% on the second half if unpaid. Most counties offer online payment through the county treasurer's website. Contact your county for payment options.

Statewide framework for Washington. Your county's specific rates and deadlines are shown above.