Blue Heron Netting: Year-Round Necessary?

PA koi pond, netted against herons. Asks if netting needed all year or if herons have a "season."

Herons Hunt Year-Round

Great Blue Herons are opportunistic. Migration timing varies—some overwinter in PA if water stays open. This year, migration patterns are erratic.

Recommendation

Leave netting on 12 months/year. The one night you remove it is the night a heron visits. Taut, fine-mesh netting (≤1 inch) is the only reliable barrier. Decoys, sprinklers, fishing line fail eventually.