Humboldt Transit Authority

Humboldt Transit Authority operates 8 routes in California with 333 stops and connects with Mendocino Transit Authority, Redwood Coast Transit and Trinity Transit.

Routes and weekday frequency

Weekday midday frequency, by route

6 31–60
2 no midday

Each route is judged by its slower direction. A dash means no sustained service in that period.

Bus routes (8)
Route	AM peak	Midday	PM peak	Evening	Overnight
A Gold Arcata Gold Loop	Limited	every 60 min	every 60 min	—	—
A Red Arcata Red Loop	Limited	every 60 min	every 60 min	—	—
E Gold Eureka Gold Loop	every 35 min	every 60 min	Limited	—	—
E Grn Eureka Green Loop	every 42 min	every 60 min	Limited	—	—
E Prpl Eureka Purple Loop	Limited	every 60 min	every 60 min	—	—
E Red Eureka Red Loop	every 35 min	every 60 min	Limited	—	—
Nse299 North State Express 299	Limited	Limited	Limited	—	—
Shi Southern Humboldt Line	Limited	Limited	Limited	Limited	—

Nearby agencies

Scheduled service, not live arrivals. Schedule refreshed Oct 12, 2026, valid through Jun 30, 2027. Atlas data release Oct 13, 2026. Official site: Humboldt Transit Authority.