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From Sonoma Magazine

Barn owls are the sole vineyard workers to take no note of harvest season. From their perspective up in tree hollows, barn lofts and custom nest boxes mounted on poles, the rows of vines laden with ripe fruit are of little interest.

They’re focused instead on the ground below, where their work is done and their food — rodents — is found. A family of barn owls may eat more than 1,000 in a single season. That translates into a lot of critters that won’t be feasting on the tasty (so we hear) roots of grapevines.

Kelsey Reidinger of Sonoma County Wildlife Rescue says that roughly half of the 40 or so new nest boxes installed annually through its 13-year-old Barn Owl Maintenance Program (BOMP), are placed in vineyards.

“Because gophers can cause such issues for winegrape growers, barn owls are attractive to vintners,” she says.

Members of the Wildlife Rescue’s Barn Owl Management Project introduced a foster owl, second from right, into an established family on a vineyard property in Sonoma County. The owls reduce rodent populations, bringing up to 25 gophers back to the nesting box each night. (John Burgess/The Press Democrat) The other half of the group’s owl boxes go into other types of agricultural fields. Either way, the real winner is the region’s overall ecological balance. Barn owls are natural predators of gophers, and our open landscapes are their natural habitat. That’s why they’re called barn owls, after all: They tend to find shelter there, surrounded by farmland.

Barns and fields mimic the tree cavities in grasslands and savannas to which they’re adapted. (Great horned owls, also common countywide, prefer more wooded areas.) Resident owls also forestall the need for rodent poisons, which can be counterproductive by also killing predators.

Though barn owls don’t give a hoot about harvest, late summer and early fall are important for other reasons. This is when juvenile owls, at their own ripe old age of two months, fledge from the nest. And it’s when vacant owl boxes must be thoroughly cleaned, another service that Sonoma County Wildlife Rescue provides.

“After they’re born, these owls are doing all of their business inside of the box, and they do no housekeeping,” Reidinger explains. “Over the 60 days that they’re in the box, it leads to inches of material.”

After all, a clean owl box is a healthy owl box, and a healthy barn owl is worth more than its weight in fine wine.