The outdoor scenes of Summer Magic may have been filmed in part on Disney's Golden Oak Ranch.This was land purchased by Walt Disney in 1959 to be utilized as a shooting location for both his film & television projects.It is located in Newhall,CA which is about an hour north of L.A.It is 691 acres.Disney's Toby Tyler was filmed there,as was The Apple Dumpling movies & the Swamp Fox.Non-Disney films as well as tv shows have also shot there such as the mini-series Roots 2,for which a town was constructed.Other tv shows filming there have been Daniel Boone,Bonanza,Murder She Wrote,& countless others.

In the Spring 2010 issue of D23 magazine, it has a lengthy article on the back lot at Disney Studios, which has a picture showing the yard and barn (showing the big yellow house to be merely a facade). The article also mentions that "Summer Magic, starring Disney Legend Hayley Mills, used the east portion of Western Street, adding the four-sided facade of a church on the street's north end. This church was later altered for Pete's Dragon to serve as a schoolhouse for the town of Passamaquoddy."

Hayley Mills left England in late July 1962 to shoot Summer Magic in August. I just found out an interview of Burl Ives & Hayley Mills made on the set of the movie and published in The Deseret News of August 27, 1962. Obviously, the film was shot at Disney Studios, Burbank, California.

I can almost guarantee this was all shot on sound stages. Except maybe the bug stock footage.