A little late to respond, but here is what I can share.
Sharp Practical Shooters holds USPSA once a month, Outdoor during late Spring through early Fall, then move indoor to Sharp Shooting Indoor Range. Usually 4th or last Sunday.
Fernan Rod and Gun holds USPSA outdoor matches about the same yearly schedule as Sharps, 3rd Saturday, this winter they've been holding steel matches. They also have 3-gun during the warmer months, depending on volunteer participation.
Lewiston Pistol Club which is about 2 hours south of Spokane hold 3 matches a month, 1st Sunday USPSA, 2nd Saturday Wildcat, and 4th Sunday steel. We shoot year round.
EWPSA in Benton City does a USPSA on the 3rd Sunday of the month year round also.
Big Sky in Missoula I think does USPSA on the 2nd Sunday. They may shut down for the winter, not sure, i have yet to make it there.
For larger localish 3-gun we usually travel to Parma a few times a year. About 5-6 hours south of Spokane.
Gen