Father's Day falls on June 15, 2026 — which puts the shopping window squarely in the period when Costco's outdoor cooking section is at its most fully stocked, when the grill and griddle inventory is at peak availability, and when the Father's Day gift selection at Costco reaches the specific depth that makes the warehouse one of the most commercially compelling destinations for the family that wants to give dad something he will genuinely use. Costco might not be the obvious