Food miles is a term for the distance food travels between where it is produced and where it is consumed. A tomato grown in Mexico and trucked to a grocery store in Minnesota has traveled roughly 2,000 food miles. The same tomato grown on a farm 30 miles away and sold at a farmers market has traveled 30 food miles. The concept emerged in the 1990s as a shorthand for thinking about the environmental costs embedded in food transportation.

The average American meal, by frequently cited estimates, contains ingredients that have traveled between 1,500 and 2,000 miles. Much of that distance reflects a food system structured around year-round availability of every product, regardless of season — strawberries in January, asparagus in October, always-on lettuce supply regardless of where you live or what's growing locally.

Food miles captured public attention because the number is vivid and the concept is intuitive. Local food has fewer food miles. Fewer food miles means less fuel burned, less carbon emitted, less time in transit — and therefore fresher food. That intuition is partially correct but more complicated than it first appears.

Why It Matters

Freshness is real and measurable. Regardless of carbon accounting complexity, fewer food miles reliably means fresher food. A tomato picked ripe and sold within two days is nutritionally and culinarily different from one picked weeks ago and ripened during transit. Nutrient degradation in fruits and vegetables begins immediately after harvest. Vitamin C content in spinach drops by half within a few days of harvest at room temperature. Local food is genuinely fresher food — that benefit doesn't require environmental analysis to defend.

Local economic circulation. Money spent on local food stays in the local economy more than money spent on food from distant sources. The wages, equipment, supplies, and services associated with a local farm circulate locally. Dollars spent on produce shipped from thousands of miles away leave the local economy almost entirely.

Transportation is real but not dominant. Here's the nuance that complicated the original food miles narrative: transportation is a real but relatively minor part of total food system carbon emissions. A 2008 study from Carnegie Mellon researchers found that transportation accounts for roughly 11% of food's lifecycle carbon emissions — production methods account for the other 89%. A conventionally produced local tomato may have a larger carbon footprint than an organically produced one from further away, depending on inputs, energy use, and production system.

Mode of transport matters more than distance. Air freight is 50 times more carbon-intensive per ton-mile than ocean shipping. Truck freight falls somewhere in between. Most fresh produce shipped long distances in the US travels by refrigerated truck, which is relatively efficient per ton-mile. The exceptions — air-freighted fresh berries, flowers, or fish from distant sources — are disproportionately impactful despite representing a small share of volume.

What to Look For

Freshness as the practical proxy. For most food purchasing decisions, "how far did this travel?" is a useful proxy for "how fresh is it?" — even if it doesn't tell you the complete environmental story. Buying from farms within your region reliably delivers fresher food, regardless of how you feel about the carbon arithmetic.

Seasonal alignment. Truly local, in-season food has minimal food miles because the product is only available when it's genuinely ready. Out-of-season local food either comes from heated greenhouses (high energy) or doesn't exist. Following seasonal availability — eating what your region grows when it grows it — naturally reduces food miles without requiring any accounting.

The "local washing" problem. Some retailers and restaurants use "local" loosely — "local" sometimes means "sourced from within 500 miles" or even just "sourced from within the state." Ask specifically: which farm, what distance, what practices? "Local" without specifics can mean almost anything.

Production practices alongside sourcing. If you're thinking environmentally, where food comes from is one variable. How it was produced is a larger one. Pasture-raised beef from a regenerative ranch 200 miles away has a very different environmental profile than grain-finished beef from a CAFO 20 miles away. Food miles and production practices together tell a more complete story than either alone.

Common Questions

Does buying local always reduce environmental impact?

Not automatically. Production system, soil management, and energy use in production have larger environmental impacts than transportation distance for most foods. A local farm using heated greenhouses year-round, heavy synthetic inputs, and intensive tillage may have a larger carbon footprint than a well-managed organic farm further away. For environmental decision-making, combining local sourcing with attention to production practices — regenerative, organic, pasture-based — gives you the most meaningful results.

Are there foods where food miles matter most?

Yes — highly perishable products and products shipped by air freight. Fresh fish flown from the Pacific to the Midwest has dramatically higher transportation emissions than shelf-stable products transported by ship or truck. Leafy greens that degrade rapidly benefit most from local sourcing, both for environmental and freshness reasons. Shelf-stable products (grains, oils, dried legumes, canned goods) have relatively low transportation footprints regardless of distance.

Find farms near you and reduce your food miles on the U.S. Farm Trail map.