Temperatures are expected to reach the mid 20s overnight Tuesday into Wednesday.
That means there could be more of San Antonio's homeless seeking shelter from the cold.
Prospect Courtyard, at the Haven for Hope complex, is ready to welcome those looking for a warm place to sleep and a hot meal.
"Quite frankly, we wouldn't turn anybody away," said Ed Coleman, the director of the courtyard.
The facility is able to accommodate several hundred people.
When the cold air hit Monday night into Tuesday morning, just under 500 folks sought shelter. More than a hundred of those still slept in the outside area.
Coleman said some people are just used to it and prefer it.
Tuesday, he said he was expecting more people to come knocking.
"I would expect to see more people," Coleman said. "We've got the blankets we need, we've got bedding, we've got the mats we need, so on and so forth, so we are ready to take an influx."
Coleman said if the indoor/outdoor sleeping area becomes full, they are prepared to open the cafeteria and even the on-campus chapel, if necessary.
The most the courtyard has housed in one night is just over 700.
Coleman said extra staff will be on hand.