Put supers on when the brood boxes are full of bees and a flow is starting — not before. A colony that isn't crowded will ignore a super, and empty space above the brood nest costs heat in a climate where heat matters.
How do I know a flow is on?
The bees tell you before the calendar does. Sudden heavy traffic at the entrance, white wax appearing on top bars, and the smell of nectar when you lift the lid. Weight is the honest test — heft the back of the hive and you can feel a flow starting.
In our territory the main flow usually runs from clover and alfalfa through midsummer, but it moves year to year with rain. Watch the hive, not the date.
What does "full enough" look like?
Bees covering nearly every frame in the top brood box, comb drawn out, and nectar starting to back up into the brood nest. That backfilling is the real signal — they're out of storage space and starting to use the queen's laying room.
If your top box still has undrawn foundation, they're not ready for a super. Let them finish the box they're in.
Why not just add supers early to be safe?
Because empty space above the cluster is heat they have to manage, and in a cool northern June that slows buildup. It also spreads a moderate colony thin instead of concentrating it where the work is.
Farther south this is nearly harmless advice. Here it costs you time in a season that doesn't have much to spare.
Do I need a queen excluder?
Opinions run hot on this. An excluder guarantees no brood in your honey, which makes extraction cleaner. It also slows bees moving up, and some colonies are reluctant to cross one at all.
If you use one, make sure the colony is genuinely ready to move up first. Putting an excluder on an unmotivated colony is the fastest way to get a super they never touch.
When do I add the second super?
When the first is about 70 percent drawn and filling. Adding it before that leaves you with two half-finished supers instead of one finished one.
Most first-year colonies in the northern plains manage one super in a decent year. A strong second-year colony on a good flow can fill several.
Should I stop feeding once supers go on?
Yes. Feeding with supers on puts syrup in the comb you were planning to sell as honey. Once a real flow is on they don't need it anyway.
Questions about any of this? Call or text us at (701) 809-0153. We're always happy to help, even if you didn't get your bees from us.