When Is Squirrel Season in Connecticut? A Solar Owner's Calendar

If you own rooftop solar in Connecticut, the state’s squirrel calendar is worth knowing — because every phase of it maps to a different kind of activity under your panels, and one window in particular is the right time to protect the array. Here is the year as a gray squirrel lives it, and what each season means for your system.

The Connecticut squirrel calendar

Gray squirrels in Connecticut mate in late winter and spring, and a second litter is usually born in July — so there are two den-seeking pushes a year, plus a fall surge of nest-building and food caching.

That cycle comes from the CT DEEP gray squirrel fact sheet: mating in late winter and spring, a 44-day gestation, litters of two to seven young, with the second litter typically arriving in July. Young are weaned and somewhat independent at eight to ten weeks. For solar owners the translation is simple: twice a year, pregnant females actively hunt for warm, dry, protected den sites — and the gap under a solar array is exactly that. In fall, the whole population shifts to winter prep: building sturdier nests and caching food, with heavy rooftop and gutter traffic.

Month-by-month risk for solar owners

Months	What squirrels are doing	Risk under your panels
Jan–Feb	Winter denning; first mating season begins	Existing den sites in heavy use; chewing continues in occupied arrays
Mar–Apr	First litters born; females denned up	High — occupied dens likely; do not seal without inspection
May–Jun	First litters weaned; young disperse	Young squirrels explore and claim new sites
Jul	Second litters usually born (CT DEEP)	High — second den-seeking push; nursing females under arrays
Aug–Sep	Second litters weaned	Dispersing juveniles probe for shelter
Oct–Nov	Nest-building and food caching	High traffic — heaviest rooftop activity of the year
Dec	Settling into winter dens	Occupied arrays stay occupied all winter

The uncomfortable takeaway from that table: there is no month when squirrel pressure is zero. What changes through the year is not whether they want your array, but whether they are already inside it.

What to do each season

The best window to install a critter guard in Connecticut is late winter through early spring — after winter dens can be verified empty and before the first litters arrive.

• Late winter / early spring (the install window): arrays can be inspected, cleaned out, and sealed before breeding females settle in. A guard installed now protects through both litter seasons and the fall rush.
• Spring and July (litter seasons): if you hear activity, assume young may be present. Inspection first, always — sealing a nursing female in (or out, away from her litter) is cruel and, practically, guarantees frantic chewing. Start with our guide to squirrels under solar panels to read the signs.
• Fall (the traffic season): heavy activity makes fall a common time for homeowners to first notice the problem. A guard can absolutely still be installed — the space just gets verified and cleaned first — and going into winter sealed beats hosting a den until March.
• Any season: scratching sounds, shredded material at the panel edges, or chewed debris in the gutters mean the calendar has caught up with you. The exclusion process is the same year-round: inspect, clean up lawfully, then seal.

Critter guard installation from SolarWash CT starts at $300 with under-panel cleanup included, across all 26 towns we serve in South Central Connecticut and Fairfield County. Beat the calendar instead of chasing it — call or text (203) 677-0875 for a free quote.