Sonoma County, CA Special Events & Permits: Block Party Permits (2026)
Key Facts
- Permit trigger
- over 50 participants
- Apply
- 60 days to 5 years ahead
- Issuing agency
- Permit and Resource Management Dept.
- Insurance
- up to $1,000,000 liability may be required
- Applies to
- unincorporated county only
Summary
Block parties in unincorporated Sonoma County are regulated as public right-of-way special events. A permit is required whenever a street gathering draws more than 50 participants, filed 60 days to 5 years ahead through the Permit and Resource Management Department.
"Celebration" means any activity involving a group of people gathering for the purpose of socializing and taking part in festivities. Celebrations include, but are not limited to fairs, carnivals, block parties, and festivals. ... No special event shall take place on Sonoma County highways which involves more than fifty (50) participants, unless the sponsoring persons ... has applied for and been issued a special event permit pursuant to this article.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 64 Update 2).
Full Breakdown
County code Sec. 15-25 defines a "Celebration", which expressly includes block parties, fairs, carnivals and festivals, as a type of public right-of-way special event. Under Sec. 15-27, no such event may take place on a county highway with more than 50 participants unless the organizer has obtained a public right-of-way special event permit from the Permit and Resource Management Department (PRMD). Applications go in 60 days to 5 years before the event (Sec. 15-28); the director can set conditions on road closures, timing, parking, sanitation and traffic control (Sec. 15-35), and may require up to $1,000,000 in liability insurance (Sec. 15-33). Fees are set by the Board of Supervisors to recover the county's processing costs (Sec. 15-31). This chapter governs only the unincorporated county, Santa Rosa, Petaluma, Rohnert Park, Windsor, Healdsburg, Sebastopol, Cotati, Cloverdale and the City of Sonoma each run their own event-permit programs under their own municipal codes.
Violations & Fines
Running an unpermitted street event over the 50-participant threshold is an infraction under Sec. 15-30. PRMD, a deputy sheriff, fire marshal or CHP officer can suspend or revoke a permit for noncompliance or false information, and repeat violations can bar new permit applications for up to three years.
Frequently Asked Questions
Do I need a permit for a small block party in Sonoma County?
How far in advance do I have to apply?
Does this rule apply inside the City of Santa Rosa or City of Sonoma?
Sources & Official References
Other rules in Sonoma County
California rules heatmap·Compare Sonoma County to another location·View the California special events & permits overview
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