Note to readers • An update to this story can be found here.

The hillsides above the University of Utah were visibly blackened and charred Monday as a wildfire continued to scorch the dry, grassy area.

But crews have started to get better control of the blaze, which sparked Saturday afternoon in the foothills east of Salt Lake City, said Sierra Hellstrom, a spokesperson assigned to what has been named the Bonneville Fire.

As of Monday afternoon, the wildfire had burned 566 acres and was considered 5% contained. A containment level marks the perimeter of the blaze where crews feel confident it will not move beyond. Hellstrom anticipated that percentage would grow into the night.

“We are feeling really good about the progress made,” she said.

On Sunday, when flames and smoke were seen widely across the Salt Lake Valley, residents in the Arlington Hills area were told to be ready to evacuate if needed.

That “ready” order was lifted Monday around 1:15 p.m. Crews in the area have been able to maintain the perimeter closest to homes, Hellstrom said, especially after winds shifted away.

“Those residents can rest easy tonight,” she added.

The University of Utah Hospital and the Huntsman Cancer Institute, which sit just at the edge of the fire, both remain open and accepting patients.

The Natural History Museum of Utah and Red Butte Garden and Arboretum, which sit on the foothills of campus, were also open to guests Monday.

[Read more: Here’s how the U.’s campus has been impacted by the Salt Lake City fire]

The fire didn’t cross into Red Butte’s grounds, said spokesperson Kate Randall, but “it came very close” on Saturday evening, when guests both there and at the museum were evacuated.

Cooler conditions and humidity Sunday evening helped quiet the Bonneville Fire overnight.

Still, temperatures rose into the 90s Monday with winds of up to 15 mph forecast. The steep, rocky fire terrain is also difficult to manage. And crews are running into rattlesnakes, Hellstrom said, which live in the foothills.

High heat can reignite hotspots, Hellstrom added, and fires can be “unpredictable.”

“We want the public to be prepared,” she said. “The biggest concern is going to be heat.”

As such, people have been asked to avoid the area, where trails — including Bonneville Shoreline, City Creek, Dry Creek and Red Butte — remain closed. Fire officials ran into several people hiking Monday morning and had to stop them, Hellstrom said.

The cause of the fire remains unknown at this time, she added.

There were about 150 personnel assigned to the blaze as of Monday afternoon, she noted, and four helicopters. Aircraft have been dipping into nearby reservoirs to collect water to drop on flames, and several airplanes dropped bright-red fire retardant Sunday.

Crews saw a personal drone flying near the area Sunday afternoon, Hellstrom said, which grounded all professional aircraft for about an hour. Drones are not allowed to fly near fires for safety.

“This endangers pilots and leaves crews on the ground unsupported,” noted a news release. “If you fly, we can’t.”

Air quality in the Salt Lake Valley improved slightly Monday after hitting “unhealthy” levels Sunday. Most of the smoke now resettling in the valley is from other fires burning in the state, Hellstrom said.

The Bonneville Fire currently is the second biggest in Utah. The largest, the Iron Fire southwest of Utah Lake, was at about 26,000 acres Monday morning, Hellstrom said.

It is 0% contained. Residents in the small nearby town of Eureka remain under evacuation orders. The flames are threatening about 365 homes.

Those are the two largest of five bigger wildfires currently burning.

Meanwhile, the Middle Fork Fire in Ogden is about 75% contained at more than 300 acres.

The Sawmill Fire in the southwest corner of the state sits at nearly 4,000 acres and 15% containment.

And the Hastings Fire in Tooele County is about 6,000 acres, with no containment.

Hellstrom said the amount of wildfires is concerning for June. “We’re very early in the season,” she said.