Families in Solano County can celebrate Halloween 2026 without crossing the entire Bay Area. Vallejo, Vacaville and Fairfield each have published October events, including free trick-or-treat routes, an island block party, and an outdoor family movie. Pick a neighborhood and check the organizer’s announcement before leaving.

Updated October 11, 2026: Date-specific listing. Check with organizers for last-minute changes, admission and ticket requirements.

7 Halloween events in Solano County

1. Downtown Vacaville Trick or Treat Candy Stroll

Where: Main, Merchant and Parker streets, Vacaville. When: October 31, 2026, 4–6 p.m..

Free family candy walk through downtown merchants with music and a scarecrow contest. Local organizers confirm the 2026 date. Event details and organizer information.

2. Mare Island Halloween Block Party

Where: 1015 Walnut Avenue, Mare Island, Vallejo. When: October 24, 2026, 4–8 p.m..

Free admission with RSVP requested; trick-or-treating, pumpkin decorating, face painting, food trucks and family-friendly zombie-photo activities. Goodie bags for children 13 and younger are while supplies last. Event details and organizer information.

3. Downtown Vallejo Costume Contest & Stroll

Where: Downtown Vallejo, around Bambino’s and the Farmers Market. When: October 31, 2026, 10 a.m.–2 p.m..

A merchant trick-or-treat route with a costume competition; organizer listing places judging at 1 p.m. in downtown Vallejo. Event details and organizer information.

4. Halloween on the Green

Where: Village Green Park, Fairfield. When: October 22, 2026, 6–8 p.m..

Fairfield Parks and Recreation invites families to bring costumes and candy bags for community trick-or-treat activities. Event details and organizer information.

5. Movies in the Park: Casper

Where: Village Green Park, Fairfield. When: October 23, 2026, 6:30–9 p.m..

A free outdoor screening suitable for a family fall evening. Bring a picnic blanket and layers. Event details and organizer information.

6. Nut Tree Plaza Halloween Festival

Where: Nut Tree Plaza, Vacaville. When: October 24, 2026, Noon–3 p.m..

A free fall-themed family festival with magic, crafts, face painting and activities; check organizer registration instructions. Event details and organizer information.

7. CPC Candy Kingdom Trunk or Treat

Where: 425 Hemlock Street, Vacaville. When: October 31, 2026, 2–3:30 p.m..

A neighborhood candy event organized by a faith community. Families interested in attending should review the organizer’s description and any registration details. Event details and organizer information.

Family travel plan

Vallejo is the strongest option for an October 24 family outing; Vacaville offers a separate downtown stroll on October 31. Fairfield provides earlier midweek options. Do not confuse the October 30 Downtown Vacaville Boo Bash, listed as 21+, with family programming.

Before you go

Confirm whether the event is free, sold out or requires registration. Watch evening temperatures, supervise children around parking lots and busy downtown streets, and respect posted costume and safety rules.

Planning your route? Try OptionTrip. More regional destinations: California Halloween by county.

Sources

California58 editorial guide. Program details may change. OptionTrip is a related commercial service.

Explore Solano County beyond Halloween

Explore beyond Halloween: read our Solano County year-round travel guide for attractions, outdoor places and planning ideas.

For county-specific communities, public services and local knowledge, visit the Solano County reference profile. You can also browse all California58 travel guides. Halloween 2026 events are seasonal and may change; check each organizer’s current calendar before traveling.

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