Seasonal Price Variation

How It Works

Seasonal patterns significantly affect several Cheeseburger Index ingredients, particularly produce. Tomato prices typically peak in January-March (when domestic supply is limited to Florida and imports from Mexico) and bottom out in July-September (peak harvest in multiple growing regions). The seasonal swing can be 30-50% — the BLS average price for field-grown tomatoes often ranges from $1.50/lb in summer to $2.20/lb in winter. Lettuce shows similar seasonality, with prices peaking during the transition between Salinas Valley (California summer) and Yuma (Arizona winter) growing seasons. Weather disruptions during these transitions can cause dramatic price spikes — a freeze in Yuma or excessive heat in Salinas can double lettuce prices for 2-4 weeks. Ground beef shows less seasonal variation but typically peaks in late spring and early summer (grilling season demand) and dips in fall. Cheese and bread prices are relatively stable year-round due to industrial production and storage capabilities. The Cheeseburger Index reflects these seasonal patterns, which is why month-over-month changes can be misleading — the year-over-year comparison is a more reliable indicator of underlying trends because it compares the same seasonal period.

Related Terms

• BLS Average Price Data — A BLS program that reports actual dollar prices (not index values) for approximately 70 food items at the national and regional level, published monthly — the primary data source for the Cheeseburger Index.
• Regional Price Differences — Systematic variations in food prices across U.S. geographic regions, driven by proximity to production, local labor costs, transportation logistics, and competition among retailers.
• Food Inflation — The rate at which food prices increase over time, measured as a percentage change in the food component of the CPI — historically averaging 2-3% annually but spiking to 11.4% in 2022.