Boxelder bug life cycle
FALL - adult bugs leave maple trees, congregate, seeking warm, dry place to spend winter months, this is when they are the biggest nuisance.
WINTER - adult bugs inactive, unless indoors.
SPRING - adult bugs leave winter sites, fly to maple trees, lay eggs.
SUMMER - eggs hatch, young bugs feed on maple leaves and complete development. There is only 1 generation per year.
Remember, as bad as they are, boxelder bugs will only be active outside until the weather gets cold - so the best solution may be to ignore the bugs until they go away. A final caution: In some areas yearly boxelder bug invasions have become a discloseable condition, like a leaky roof, when selling real estate. Discuss this with your real estate agent.