Top 10 Facts About Disneyland Halloween Time You Need to Know 
If you’re planning to visit Disneyland in October (or September),
you need to know some important things about the Disneyland Halloween season.
The biggest mistake that visitors make when visiting Disneyland in October is not understanding the difference between Halloween Time and the extra ticketed Halloween Party, Oogie Boogie Bash.
Halloween Time attractions and entertainment occur during the whole season for all park guests that have a park ticket and park reservation.
The Oogie Boogie Bash Halloween Party happens on select nights and is not included with your park admission but instead is a separate party ticket that must be purchased.
To maximize your time in the parks during the Halloween season, I recommend you plan on starting early, taking mid-day breaks if needed, and going back in the evenings.
Adults are not allowed to wear costumes at Disneyland EXCEPT during the Oogie Boogie Bash party.
The parks are decorated for Halloween, including lots of décor and pumpkins on display on Main Street, USA.