UPDATE 09/26/2009: Monrovia Canyon Park has been re-opened.
I'm a little behind with this one. Monrovia Canyon Park had reopened a little over a week ago after being closed due to the Station fire. The park was closed again a couple of days ago (and is still closed) due to the change in the weather (red flag warning). This time it's a day to day thing, depending on the weather conditions. The park is closed to both vehicles and walk ins. Call first before heading up there.