Colorado ? A farm couple got a huge surprise when they opened their fields to anyone who wanted to pick up free vegetables left over after the harvest — 40,000 people showed up.

Joe and Chris Miller’s fields were picked so clean Saturday that a second day of gleaning — the ancient practice of picking up leftover food in farm fields — was canceled Sunday.

“Overwhelmed is putting it mildly,” Chris Miller said. “People obviously need food.”

She said she expected 5,000 to 10,000 people would show up Saturday to collect free potatoes, carrots and leeks. Instead, an estimated 11,000 vehicles snaked around cornfields and backed up more than two miles. About 30 acres of the 600-acre farm 37 miles north of Denver became a parking lot.

Some people parked their cars along two nearby highways to take to the field with sacks, wagons and barrels.

Miller said they opened the farm to the free public harvest for the first time this year after hearing reports of food being stolen from churches. It was meant as a thank you for customers.

Farm operations manager Dave Patterson said that in previous years the Millers allowed schoolchildren and some church groups to come to the farm during the fall to harvest their own food.