Roaches are most active at night, during which time they forage for food and mate. Outdoor cockroaches in the northern United States enter a period of hibernation in winter, experiencing a suspended state of development in autumn.
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While Americans are mostly dormant when it's cold and rainy, summer is roach season and the critters can appear in droves. While it's sound practice all year long, in the summer it is particularly important to keep your kitchen clean, store food in airtight containers, and take out the trash on a regular basis.