The teenager was identified by state police as Dariel Vasquez. Officials said Mr Vasquez, who worked for the state’s parks and recreation department, was helping to fight the fire when he was killed.
As of Sunday, several brush fires were burning across the region of New England on the US east coast, fuelled by warm, dry weather.
Wildfires have also erupted on the other side of the country, in southern California, where more than 100 structures have been burned.
On Sunday, New York Governor Kathy Hochul said she was “deeply saddened” by Mr Vasquez’s death.
“My prayers go out to his family, friends and coworkers during this difficult time,” she said.
Fires on the east coast led to air quality warnings in the neighbouring states of New York and New Jersey.
One blaze, the Whitehouse Fire, is burning in Ulster and Sullivan counties, west of Hartford, Connecticut, and is up to 400 acres in size, Hochul said in a statement.
Two others are burning in Sterling Forest State Park, about 45 miles (72 km) north of New York City.
Earlier in the week, a brush fire erupted in Brooklyn’s Prospect Park, spreading the smell of smoke across New York City. Wildfires rarely occur within city limits, but the region is in the middle of a drought.
Officials said it took about three hours and more than 100 first responders to put out the blaze.
In Orange County, where the Sterling Forest State Park fires are burning, County Executive Steve Neuhaus urged nearby residents to have an evacuation plan in place.
“At this time, the Incident Command team has not indicated that evacuations are imminent, but we continue to monitor the situation carefully,” he said in a Sunday update.
Officials in New Jersey have warned residents against lighting open fires and have asked them to “take every precaution possible for fire prevention.
On Saturday, a 37-year-old man was arrested in New Jersey’s Jackson Township for allegedly sparking a blaze earlier in the week by firing his shotgun.
Richard Shashaty faces multiple charges including arson, according to the New Jersey Forest Fire Service.
In southern California, crews have managed to contain 26% of the Mountain Fire in Ventura County, which has burned more than 20,000 acres as of Sunday.
That fire destroyed 132 structures, mostly homes, in less than two days, officials said on Thursday. Its cause remains under investigation.
California officials said the fires spread due to the Santa Ana winds, which are dry, warm, and gusty winds that blow from the interior toward the coast during the autumn months.
Scientists have noted how climate change is making the weather conditions needed for wildfires to spread more likely.