Ontario Halloween Haunt

October 30, 2026, 10:30 a.m.-12 p.m.

 Ovitt Family Community Library
215 East C Street
Ontario CA
Free ages 0-5 years

Wear costumes and scurry through the library on a treat parade. Free and designed for toddlers and youngsters.

Halloween Costume Carnival

October 30, 2026, 5-7 p.m.

Dorothy A. Quesada Community Center
1010 South Bon View Avenue
Ontario, CA
Free, ontarioca.gov all ages invited

• Get ready for a ghostly good time
• Special Entertainment
• Come dressed in your favorite costume and enjoy fun games, prizes and festive activities.

Ontario Halloween Contest & Trunk or Treat

October 29, 2026, 3-8 p.m.

Ontario City Hall
303 East B Street
Ontario CA 91764
All Ages Free, ontarioca.gov

The City of Ontario invites the public to its trunk or treat. Participants receive a trick-or-treat bag, a participation ribbon, and light refreshments. New this year: enjoy our exciting Trunk-or-Treat experience! This event is free for all participants. For more information, please call (909) 395-2020.

Kids can participate free and can come in costume to go trick or treating at car trunks. These are not just any car trunks. They are decorated in themes and designs for Halloween.

Monsters in Motion

October 22, 2026, 3:30-5 p.m.

De Anza Park, Community & Teen Center
1405 South Fern Avenue
Ontario CA 91762
Free, ages 7-12 years, ontarioca.gov

High-energy party filled with fun games, dancing, and silly monster moves. Costumes are encouraged, so come dressed up and get ready to have a monstrously good time. For information, please call (909) 395-2030.

Howl-o-Ween Costume Dog Pawty

October 17, 2026, 9 a.m.-12 p.m.

Schimmel Dog Park
950 N. Cucamonga Ave.
Ontario, CA
Free event, open to all ages, ontarioca.gov

Bring your pooch for some Halloween fun with lots of howling going on:

• Puppy Games
• Costume Contest
• Pet-friendly Vendors

Historic Cemetery Tour

October 10, 2026, 10 a.m.

Ontario Heritage & Bellevue Memorial Present the 13th Annual Richard D. Delman Historic Cemetery Tour

Bellevue Memorial Park
1240 W. G Street
Ontario, CA
$25, ontarioheritage.org

Visit with some of Ontario's early citizens as local costumed actors bring characters to life. Ticket sales begin at 9:30 a.m. and tour starts at 10:15 a.m.

Other fun events in Ontario include the free summer concerts and Easter Egg Hunts.

Events are not guaranteed. It is your responsibility to confirm before going.