Anytime of the year is breeding season for these guys

Easiest way to make an incubator is to get a large styrofoam box (fishmarkets will give them to you), rubbermaid containers, and an aquarium heater. Fill the styro partway with water and set the rubbermaids in them, you can then set individual deli cups inside the rubbermaids. By heating the water (with the aquarium heater) you evenly distribute the heat. Place thermometers in there to guage the temp and you all set