Cold kills some insects outright: Sudden, extreme cold (especially without insulating snow) can kill insects that overwinter as adults, eggs, or larvae.
Snow can limit survival in some cases: If snow comes late or melts early, insects may be exposed to lethal freeze–thaw cycles that damage their cells.
Fewer survivors = fewer breeders: If enough insects die over winter, there are simply fewer adults to reproduce in spring and summer.
But here’s the catch: ❄️🪲
Snow is a blanket: A thick, steady snowpack insulates the ground and protects insects overwintering in soil, leaf litter, or bark. This can increase survival.
Many insects are cold-adapted: Some produce natural antifreeze compounds and can survive temperatures well below freezing.
Fast rebound in summer: Insects reproduce quickly. Even if winter knocks numbers down, a warm, wet summer can bring populations roaring back.
What really reduces summer insects the most:
Late hard freezes after early warm spells (catches insects active and unprepared)
Dry springs (bad for larvae and eggs)
Cold, wet summers (slows reproduction)
So,what does this mean?
❄️ Harsh, inconsistent winters → more likely to reduce insects
❄️ Long, steady snowy winters → often protect them
🌞 Warm, wet summers → insect boom regardless of winter