I am from Seattle. There are North options for you. There is Lake Stevens and Lake Sammish (South of Bellingham). I talked to a guy one time though that lived on Whidbey and he kept his boat in Eastern WA.
You can ride all your round, it is cold and you need more than if you were riding year round in Sacramento. Average season for the average rider would be March/April to September/October. Depends on the year. This year we had great weather in March, I rode every weekend up at Lake Stevens, but the weather went kinda sour in August, so most stopped riding in September.
(Message edited by tcluv85 on November 15, 2004)