I recently bought the 3-day SoCal resident passes, just wondering if I have to use the 3 days consecutively or can I go once this weekend and the next two days next month?

Depending on where you got them, yes they can be used throughout the next few weeks, we purchased ours at our hotel near Disneyland, and it allowed us to use today, and the last day expired in may, other's need to be used consecutively.

Those can use any time but they check for week days or weekends and sometimes the holidays they are restricted. Have fun