This weekend, it is time to fall back into autumn! Help fall follow summer at Leap’s Sandcastle Contest. Literally get to harvest corn at the Ardenwood Farm Harvest Festival. And see if scarecrows really do have brains, at the San Anselmo Library’s event Make a Scarecrow! Sandcastles and corn and scarecrows, oh my!

San Francisco

Alemany Farm Harvest Festival (pictured)
Visit this volunteer-run organic farm ecosystem for farm tours, kids’ games, T-shirt making, face painting, bike powered hayrides, garden and orchard tasks, music and a BBQ potluck. Learn how to grow your own food, and have lots of fun doing it! Sat., 11:00 am – 5:00 pm. San Francisco. Free. All ages. Event details.

Leap’s Sandcastle Contest
The theme of this year’s contest is Sandblast, and kids worked with designers and architects to help come up with sandcastle ideas! Watch as the teams build for four hours, and see characters and structures appear right before your eyes. Teams and sponsors raise funds for Leap, which supports arts education in public school classrooms. It is free to come and watch the contest, which should be a blast! Sat., 10:00 am – 4:00 pm. San Francisco. Free. All ages. Event details.

East Bay

Ardenwood Farm Harvest Festival
Everyone gets to work on this working farm! Bring your own bag, and harvest your own corn to take home. Ride a horse-drawn train, watch ice cream being made and sample old-fashioned treats. Tour the Patterson House, watch a magic show and join in a sing-along for some old-fashioned fun! Sat. – Sun., 10:00 am – 4:00 pm. Fremont. $8 per adult. $6 per senior. $5 per child. Under 4 free.  All ages. Event details.

Rockridge Out & About Street Festival
Celebrate at the festival’s Kid’s Court with music, dancing, circus arts, a climbing wall, pumpkin carving, four square, face painting, soccer and a goat petting zoo. Fall into fun! Sun., 12:00 pm – 6:00 pm. Oakland. Free. All ages. Event details.

Marin

Make a Scarecrow!
Bring your old clothes and hats of all sizes, and join the San Anselmo Library for a special autumn program of making scarecrows! Materials for creating the heads and bodies, including hay, and assorted decorations will be provided. It’s a no brainer. Sat., 2:00 pm – 4:00 pm. San Anselmo. Free. All ages. Event details.

Green Halloween Costume Swap Day
Coordinated by EcoMom Alliance and hosted by Marin Kids & Maternity Consignment, bring a costume, take a costume! All costumes left at the end of the day will be donated to Marin Head Start.  Enjoy FREE snacks, information, entertainment, there will be photography and more! Sat., 11:00 pm – 4:00 pm. San Rafael. Free. All ages. Event details.

Nicasio Valley Farms Pumpkin Patch
Pick the perfect pumpkin, play games, create crafts and enjoy local food and drinks. Ten percent of pumpkin sales that day support the Marin Agricultural Land Trust (MALT). Grow up, and help keep things growing! Sun., 10:00 am – 4:00 pm. Nicasio. Free. All ages. Event details.

Peninsula

Woodside Day of the Horse
Kids can horse around, and pay tribute to their equine friends with a day of fun and festivities! They can ride ponies and the Wells Fargo Stagecoach, take part in horse related activities and learn more about horses, horse organizations and opportunities for riding in the area. Giddyup! Sat., 10:00 am – 2:00 pm. Woodside. Free. All ages. Event details.

Championship Pumpkin Weigh-Off
Even though this event isn’t technically this weekend (it’s on Monday, October 4) we couldn’t help loving what is considered to be the “Super Bowl of Weigh-Offs!” Watch as farmers and forklifts line the streets with their pride and joy: humongous pumpkins! Last year’s winner weighed in at 1,535 pounds. Maybe the “The Great Pumpkin” will appear after all! Mon., 7:00 am – 11:00 am. Half Moon Bay. Free. All ages. Event details.           

— Rachel Teichman