Guide
If you've moved somewhere high — Denver, Albuquerque, Salt Lake, or anywhere above about 3,000 feet — your trusted recipes may suddenly betray you: cakes that dome and crack then collapse, breads that over-rise and taste yeasty, cookies that spread into puddles. Nothing is wrong with your baking. The air is just thinner, and a few targeted tweaks put things right.
Two things happen as you climb. First, lower air pressure means gases expand more easily, so leavening (baking powder, soda, and yeast) works too aggressively — batters rise fast, outpace their structure, and then fall. Second, water boils at a lower temperature, so moisture evaporates faster during baking, leaving goods dry and prone to sinking. Almost every high-altitude adjustment is aimed at one of those two problems.
The numbers are concrete. The USDA notes that atmospheric pressure falls from 14.7 pounds per square inch at sea level to 12.3 at 5,000 feet and just 10.2 at 10,000 feet — roughly half a pound less for every 1,000 feet you climb. Because of that, water's boiling point drops by a little under 1°F for every 500 feet: it boils at 212°F at sea level but only about 203°F at 5,000 feet. Your batter reaches that moisture-flashing temperature sooner and loses water faster, which is exactly why altitude bakes come out dry unless you add liquid back.
Links to Amazon are affiliate links — as an Amazon Associate we earn from qualifying purchases at no cost to you.
These pull in opposite directions on purpose — you're re-balancing a recipe that was tuned for sea level. Change one variable at a time when you can, and keep notes.
| Elevation | Leavening | Sugar | Liquid | Temp |
|---|---|---|---|---|
| Sea level–3,000 ft | No change | No change | No change | No change |
| 3,000–5,000 ft | −⅛ tsp per tsp | −1 tbsp per cup | +1–2 tbsp per cup | +15°F |
| 5,000–7,000 ft | −¼ tsp per tsp | −2 tbsp per cup | +2–4 tbsp per cup | +20°F |
| 7,000–10,000 ft | −⅜ tsp per tsp | −3 tbsp per cup | +3–5 tbsp per cup | +25°F |
These are moderate starting points, not laws — every recipe and oven is different. Our altitude calculator applies these adjustments to your specific recipe amounts so you don't have to do the fractions by hand.
If your bakes still dome and sink after a first pass, the usual culprit is too much leavening. King Arthur Baking cuts baking powder and soda more steeply as elevation rises. This chart shows what to use in place of each teaspoon the original recipe calls for:
| Original | 3,000–5,000 ft | 5,000–6,500 ft | 6,500–8,000 ft |
|---|---|---|---|
| 1 tsp | ⅞ tsp | ½ tsp | ¼ tsp |
| 1½ tsp | 1¼ tsp | ¾ tsp | ½ tsp |
| 2 tsp | 1½ tsp | 1 tsp | ¾ tsp |
King Arthur pairs this with three other moves: increase the oven by 15–25°F (use the smaller bump for chocolate or delicate cakes), decrease sugar by about 1 tablespoon per cup, and add flour to strengthen structure — 1 extra tablespoon per recipe starting around 3,500 feet, plus another tablespoon for each additional 1,500 feet. Above 6,500 feet, notice how aggressively the leavening drops: a recipe calling for 1 teaspoon of baking powder may want only ¼ teaspoon.
Suppose your sea-level cake uses 1½ teaspoons baking powder, 1½ cups sugar, and 1 cup milk, baked at 350°F. At 6,000 feet you'd land in King Arthur's 5,000–6,500 band: drop the baking powder to about ¾ teaspoon, trim the sugar by roughly 1½ tablespoons (1 tbsp per cup), add around 3 tablespoons of extra milk to offset evaporation, stir in an extra tablespoon or two of flour, and raise the oven to 365–375°F. Then start checking for doneness several minutes early, because the hotter oven and thinner air both speed the bake.
Yeast breads rise faster at altitude, so let them prove until doubled by sight, not by the clock, and consider a touch less yeast; King Arthur even suggests slightly cooler water to slow fermentation. Cookies usually just need a small flour bump and slightly less leavening to stop spreading. Cheesecakes and custards are the most forgiving, since they rely on eggs rather than chemical leavening. Deep-frying and candy shift too: because water boils cooler, use an instant-read or candy thermometer rather than time or the "hard-crack" feel you remember from sea level.
Do I need to adjust below 3,000 feet? Rarely. Most bakers don't see meaningful changes until around 3,000 to 3,500 feet, which is where authorities generally set the "high altitude" line. Between there and 3,000 feet, tweak only if your results are consistently off.
Does bread need the same changes as cake? Not quite. Chemically leavened cakes and quick breads need the leavening, sugar, and liquid tweaks most; yeast breads mostly just rise faster, so watch the dough rather than the clock and hold back a little yeast.
Which single change matters most? Cutting the chemical leavening. If you only do one thing for a sinking cake, reduce the baking powder or soda first — it's the fix that resolves the most failures.
Why did my cookies suddenly spread? Thinner air and faster spreading before the structure sets. A little extra flour and slightly less leavening usually pulls them back together.
→ Get your altitude adjustments calculated