The cold weather rolling in Tuesday night means homeless shelters are scrambling to make room for an influx of people looking to stay warm. The front also arrives at the same time that a new state law goes into full effect.

As Macon braces for winter weather this week, homeless shelters and nonprofits are already anticipating demand for beds and resources to weather the cold.

Advocates with Housekeys Action Network Denver (HAND) say the city's shelters need to add capacity, transportation options and clearer information for advocates and people living on the street.

Hillsborough, Pasco, Pinellas and Sarasota counties are opening their cold weather shelters on Monday and Tuesday.

The Salvation Army, located at 417 Rutherford Road in Greenville, opens its cold-weather shelter when overnight temperatures drop below 40 degrees. The Salvation Army of Greenville is open Monday through Friday, from 8 a.m. to 4:30 p.m. Click here to donate to the Salvation Army of Greenville, Pickens, and Oconee.

Volusia will open a shelter Monday through Wednesday, too. Temperatures are expected to dive into the mid-30s.

Cold weather shelters are opening across the greater Tampa Bay region as temperatures are expected to dip below 40 degrees with lower wind chills throughout the week. They're to assist those who are homeless or live in homes without adequate heat who are unable to find other accommodations.

NPR visited a homeless shelter in Washington, D.C., to see how residents and staff are faring during a cold emergency. The shelter is busy year-round, though the frigid weather brings in more people.

Outreach teams are working round the clock to ensure the homeless are safe in this cold snap. Ron Book with Miami-Dade's Homeless Trust says they have placed over one hundred people in emergency shelters during the past two days.