Overwintering nucs: the work that decides March happens in August — my setup

18 years in Tyrol, and the single biggest upgrade to my operation was learning to overwinter nucs reliably. Every spring loss becomes a shrug instead of a purchase. But the nucs that make it to March are built NOW, not in October — so consider this your nudge. My recipe: 5-frame nucs made up by mid-August at the latest, each with a young laying queen (this year's), two frames of brood, two of stores, one of pollen/comb. Feed 1:1 lightly to keep the queen laying, switch to 2:1 in September until they're heavy. The part that matters at altitude: warmth-sharing. I winter nucs in pairs, side by side in a divided box so they share a wall, or directly on top of a strong production colony over a screened board — the rising warmth from below is worth more than any insulation you can buy. Solo nucs on their own stands are the ones I used to lose. Resource frames all summer make this trivial: every strong colony donates a frame of capped brood now and then, and August-you assembles nucs from the bank instead of robbing one hive blind.