MORGAN HILL -- Fire crews halted a 50-acre vegetation fire in the open-space area near Calero County Park, west of Highway 101 and Morgan Hill, but fire officials said they expect crews to be on the scene overnight, mopping up and looking for hot spots.

Cal Fire Capt. Paul Provence said at one point they had two helicopters, four air tankers and a spotter plane working the fire from above while about 60 firefighters were on the ground, including crews from San Jose.

He said that while it is not considered contained, they have "stopped the forward spread" of the fire, which is located near Uvas and McKean roads.

"That means we cooled the head of the fire off so that it is not advancing, but we have not put a line all the way around it," Provence said.

Ground crews and bulldozers were working to do that around 5:15 p.m., he said.

A barn was at one point threatened by the blaze but crews were able to prevent the flames from reaching the structure.

San Jose crews knocked down another grass fire on Long Valley Trail about four miles to the north, which also initially threatened structures before being surrounded and contained before 4 p.m. It was first reported around 3:20 p.m.

San Jose fire Capt. Rob Brown said it burned a little more than an acre, and they quickly got a Cal Fire helicopter to the scene to "knock the head out of it."

After 4 p.m., they were in "mop-up mode," Brown said.

Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.