Price determined by https://fred.stlouisfed.org/series/APU0000709112

Average Price: Milk, Fresh, Whole, Fortified (Cost per Gallon/3.8 Liters) in U.S. City Average (APU0000709112)

Most recent price update when question was created: Jul 2025 $4.162

If the monthly average price according to the data and chart reaches above 4.50 any time before December 31 2026, then this resolves to yes, otherwise, this resolves to no. After trading stops there may be a delay to wait for the stlouisfed to post the December 2026 average price.