High-Altitude Baking: How to Adjust a Sea-Level Recipe

This is for the person who moved to Denver, Salt Lake City or Santa Fe this year and is about to bake the family’s holiday recipes there for the first time. It is also for anyone spending Thanksgiving or Christmas at a mountain cabin with a recipe written at sea level: Grandma’s pound cake, the cookies everyone expects, the rolls, the fudge. The recipe that never failed now sinks in the middle, runs across the cookie sheet, or comes out dry. Nothing is wrong with you or the oven. The air is thinner, and a few small changes fix most of it.

Not sure how high you are? The iPhone’s built-in Compass app shows your elevation along with your coordinates, once Location Services is turned on for Compass. A map or your town’s website will also tell you.

Why sea-level recipes fail up high

USDA’s Food Safety and Inspection Service says most cookbooks treat 3,000 feet as high altitude, and that most of the western United States is wholly or partly that high. Colorado State University Extension explains the two things that change as air pressure drops:

• Leavening gases expand more quickly. Baking powder, baking soda, yeast and beaten egg whites all push harder. A cake’s cells stretch until the texture goes coarse, or break, and the cake falls.
• Water evaporates faster and boils at a lower temperature. CSU puts the boiling point of water at 212°F at sea level, 203°F at 5,000 feet, 198°F at 7,500 feet and 193°F at 10,000 feet. Batters lose more moisture in the oven, so sugar ends up more concentrated, which weakens the structure further; and anything boiled or simmered cooks more slowly.

CSU’s first piece of advice is the one most people skip: don’t assume the recipe will fail. Try it once as written. Many recipes, especially sturdy ones like muffins and biscuits, need little or no change. If it does go wrong, change one thing at a time so you know what fixed it.

Cakes: the adjustment table

Cakes are the most delicate balance in baking, so they get the most specific numbers. These are from Colorado State University Extension’s High Altitude Food Preparation guide. Start with the smaller number in each range.

CSU adds three things. Measure leavening carefully and cut baking powder and baking soda alike. In a rich cake, 1 or 2 tablespoons less shortening can help, because fat, like sugar, weakens the structure, and an extra egg strengthens it. Between 3,000 and 3,500 feet, below where the table starts, bake the recipe as written first.

A worked example at 5,280 feet

Say the family yellow cake calls for 2 teaspoons of baking powder, 1½ cups of sugar, 1 cup of milk and a 350°F oven. Using the first column:

• Baking powder: 2 teaspoons × ⅛ less = ¼ teaspoon less, so use 1¾ teaspoons.
• Sugar: up to 1 tablespoon less per cup, so up to 1½ tablespoons less. For a first try, take out 1 tablespoon.
• Milk: add 1 tablespoon (the low end of 1 to 2).
• Oven: 365°F (15°F hotter). A hotter oven bakes faster, so we’d start checking a few minutes before the recipe’s time.

Boxed cake mixes are simpler: CSU notes that most boxes already print high-altitude directions, usually extra flour and liquid. Follow the box.

Cookies that spread flat

CSU points out that many cookie recipes have more sugar and fat than they need even at sea level, which is why they sprawl across the sheet up high. Many still turn out fine; when they don’t, CSU suggests some combination of:

• a slightly hotter oven,
• a little less baking powder or soda,
• a little less fat and/or sugar, and
• a little more liquid and flour.

CSU doesn’t give cookie numbers, so borrow the cake table’s first column as a starting point and change one thing per batch. Line the sheets with parchment, too: CSU warns that baked goods tend to stick more at altitude. Above 7,000 feet, CSU says food tastes blander, so add a little extra spice to gingerbread and snickerdoodles.

If you’re baking ahead for the holidays, test one sheet before you mix and freeze six batches of dough. Here is how to freeze cookie dough or baked cookies for December.

The rest of the holiday table, up high

• Roast turkey: no change. USDA FSIS says to use the sea-level time and temperature guidelines when oven-roasting meat and poultry, because oven temperatures aren’t affected by altitude. The finish line is the same too: 165°F on a food thermometer for a whole turkey and for stuffing, cooked alone or in the bird. FSIS adds that it is easy to overcook meat or scorch casseroles up high, which is one more reason to go by the thermometer.
• Braises, pot roast, boiled potatoes and soups take longer. Water boils at a lower temperature, so FSIS says meat and poultry cooked by moist heat may take up to a quarter more time at 5,000 feet. Plan for the mashed potatoes to take longer to get tender, and keep pots covered; CSU says dry mountain air pulls moisture out faster.
• Pie crust: usually fine. CSU says pie crusts generally aren’t affected by altitude, though a little more liquid may help the dough come together.
• Cream pie and pudding fillings: above 5,000 feet, CSU says a double boiler doesn’t get hot enough to fully thicken the starch. Cook the filling over direct heat instead, stirring.
• Dinner rolls and bread: dough rises much faster. CSU suggests using less yeast, letting the dough rise only until just doubled (over-proofed dough collapses), and possibly a second rise for flavor. Dry flour may need a little more liquid. For bread machines, CSU’s starting point is ¼ to ½ teaspoon less yeast per packet the recipe calls for.
• Fudge, brittle and candy: cook to a lower finish temperature. CSU says to boil water, read the thermometer, and lower the recipe’s target by the difference between that reading and 212°F, about 2°F for every 1,000 feet. The cold-water test works at any altitude.
• Frying (latkes, doughnuts): CSU suggests lowering the oil temperature about 3°F per 1,000 feet so the outside doesn’t brown before the inside cooks. Frying latkes for Hanukkah? They can be fried ahead and frozen.

Bringing a dish from sea level?

A cake or pie baked at home and driven up the mountain doesn’t need any adjustment; the changes only matter while it bakes. If you’re baking at the cabin instead, bring the adjusted version written down, plus parchment, a food thermometer and an oven thermometer if the rental’s oven is unfamiliar. An unfamiliar oven running hot or cold is a separate problem from altitude, and it’s worth knowing which one you’re fixing.

Where RecipeScan helps, and where it doesn’t

What it can’t do: RecipeScan has no high-altitude setting. It doesn’t know your elevation and won’t change baking powder, sugar, liquid or oven temperature for you. Its ½× to 3× scaling changes quantities only; it doesn’t account for altitude either, and doubling a cake recipe brings its own leavening and pan problems.

What it can do: keep the family recipe and your altitude changes together. Save the recipe by pasting a link from a recipe site or typing it in, then touch and hold any ingredient or step and choose Add note. The note appears under that line, and only you can see it. Write what you changed and how it turned out (“1¾ tsp, 365°F, 28 min, perfect”) and next year you won’t be starting over. Saving up to 3 recipes of your own, notes and Cooking Mode’s step timers are free. Scanning a handwritten card or cookbook page with the camera is Premium, and the scanned recipe doesn’t keep a copy of the card’s photo, so keep your own picture of the original. Here is how scanning a handwritten recipe card works.

Frequently asked questions

At what altitude do you need to adjust recipes?

USDA FSIS says most cookbooks consider 3,000 feet above sea level to be high altitude. Colorado State University Extension’s cake adjustments start at 3,500 feet and get larger as you go higher. Below that, bake the recipe as written first.

How do you adjust a cake recipe for 5,000 feet?

Using CSU Extension’s table for 3,500 to 6,500 feet: for each teaspoon of baking powder or soda use 1/8 teaspoon less, for each cup of sugar use up to 1 tablespoon less, for each cup of liquid add 1 to 2 tablespoons, and raise the oven 15 to 25°F. Start with the smaller change.

Do you need to change turkey cooking time at high altitude?

Not for a roast turkey. USDA FSIS says to use sea-level time and temperature guidelines for oven-roasting meat and poultry, because oven temperatures are not affected by altitude. Cook until a food thermometer reads 165°F. Braised or simmered meat can take up to a quarter more time at 5,000 feet.

Why do my cookies spread at high altitude?

Faster-expanding leavening and faster evaporation, combined with recipes that already have generous sugar and fat. CSU Extension suggests a slightly hotter oven, a little less baking powder or soda, a little less fat or sugar, and a little more liquid and flour.

How do you adjust candy temperatures at altitude?

Boil water and read your candy thermometer, then lower the recipe’s finish temperature by the difference between that reading and 212°F. CSU Extension says that works out to about 2°F for every 1,000 feet of elevation.

Sources: Colorado State University Extension, Food Science & Human Nutrition, High Altitude Food Preparation (boiling points, cake adjustment table, cookies, yeast breads, pie crusts, cream-pie fillings, candy, frying, practical baking tips). USDA Food Safety and Inspection Service, High Altitude Cooking (last updated Aug 13, 2024: 3,000-foot threshold, roasting at sea-level times and temperatures, up to one-fourth more time for moist-heat cooking at 5,000 feet, 165°F for whole turkey and stuffing). Compass elevation: Apple iPhone User Guide.