The event, from 10 to 3 p.m., is sponsored by the Chamber of Commerce, Ridgefield Supply Co. and the Conecticut Giant Pumpkin Grower's Club.
Pumpkins should range in size from 400 to 1,600 pounds. The weigh-off begins at noon and cash prizes will be awarded.
There also will be booths, farm stands, activities for children and lots of fun all afternoon.
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