Ada County, ID Special Events & Permits: Street Fair Rules (2026)

Ada County Code Section 8-13E-5(F), enacted with Ordinance 1002 on October 28, 2025, sets Spring Rock's two-track special event standard. For any seasonal or community event expected to draw fewer than 300 people, the only requirement is approval from the Spring Rock design committee, and no county zoning certificate is needed. Once expected attendance reaches 300 or more, the event moves to the second track: the organizer must apply for and obtain a zoning certificate from Ada County Development Services at least ten days before the event, and that application must include letters approving the event from the Kuna Rural Fire District, the Ada County Sheriff's Office, Central District Health Department, and the Ada County Highway District.

Before submitting to the county, the event must already carry documented Spring Rock design committee approval. If the county grants the certificate, the design committee then notifies the community by posting a notice at the community center and sending an e-mail or website portal notice giving the date, time, and nature of the event. A certificate for a large event can run for a period of up to four months but no longer. This standard applies only within Spring Rock. The Avimor planned community runs a parallel but separately numbered process under Section 8-13A-3(D)(5) with the same 300-person threshold, ten-day notice window, and four-agency letter requirement, while Ada County's general Title 8 zoning code contains no free-standing street fair or festival permit chapter outside these planned-community articles.