When signs of winter typically arrive where you live and how they’re changing

Red maple leaves clash in color with early-season snow in Colorado. krblokhin/iStockphoto/Getty Images

Hand in hand with brilliant foliage, fall delivers the first signs of winter to much of the United States — but the seasons are changing, and not as they normally do.

The fall season is heating up as the world warms due to fossil fuel pollution, and that’s pushing the date of the average first freeze — when the temperature hits 32 degrees or colder — later in the year for much of the country. That delay has impacts on everything from agriculture to allergens, and has also caused fall snow to decline.

The first freeze has shifted an average of 11 days later in 85% of 200 cities since 1970, according to the nonprofit research group Climate Central, with the biggest changes seen in th