For CDF there is 1 OV-10 and 1 S2T uncovered all winter at Hemet-Ryan and Ramona. THey just have to get the pilots back if needed. Useally takes about 2-3 hours. CDF helicopters are staffed year round, Mon-Fri, as long as ther is a pilot availible.
For the Forest Service, they have aircraft on somewhere almost year round. Remember North Carolina and surrounding areas start to burn this time of year also. Helicopters are contracted, so anyone can call and hire a helicopter, even people in Texas and OK. They don't need the FS to do that for them.