You can purchase tickets for the Haunted Woods and/or the unhaunted Night Corn Maze at this link.
Maris Farms offers the Haunted Woods, the premier haunt in Puget Sound. This is an outdoor haunt with about 1 mile of trails through corn fields and forests. No flashlights needed, nor allowed, but dress for the conditions and choose your shoes carefully :) There's always a potential for puddles if there's been heavy rains. The scares are can be intensely PG-13, so not recommended for youngsters (no refunds).
Posted hours of the Haunted Woods are the hours the tickets sales continue. If you have a ticket and are in line at posted closing time, the show will continue for you and all others in line.
If you'd rather not take a frightning path, try the corn maze at night! Just the right amount of spookiness for all ages! You will want to bring a flashlight for the night corn maze. Last entry to the night corn maze is at 9 PM, so if you plan to do both night offerings, plan accordingly.