Cooking at Altitude: A Denver Kitchen Guide

Clip a thermometer to a pot of water in Cherry Creek and bring it to a full rolling boil. It will read about 202°F, not 212. That missing ten degrees, the result of thinner air a mile above the sea, is why a recipe written for sea level behaves strangely here.

Lower air pressure means water boils at a lower temperature, liquids evaporate faster, and gases, including the ones that make bread and cake rise, expand more. In practice that means beans and pasta cook more slowly, candy temperatures need correcting, cake batters can over-expand, bread rises faster than the recipe expects, and a black tea such as Marco Polo can be brewed straight off the boil. This is the guide for anyone who moved here and cannot understand why the beans are still crunchy at dinnertime.

Beans

Beans show the altitude problem clearly. Dried beans cook by simmering, and Colorado State University Extension notes that anything boiled or simmered at elevation cooks at a lower temperature and needs longer. A 2023 study of dry bean cooking time found that elevation mattered, with the longest cooking time belonging to unsoaked beans at the highest elevation tested.

Three things help. Buy fresh beans: Utah State University Extension notes that older beans need longer soaking and cooking than freshly harvested ones, especially in dry climates, and the heirloom beans cooking guide covers the method. Soak them overnight; in the 2023 study, an overnight soak or a quick soak cut cooking time compared with unsoaked beans, and soaking in salted water cut it further. Utah State's overnight soak uses six cups of cold water and two teaspoons of salt for each pound of beans.

And consider a pressure cooker; New Mexico State University's extension service says one can cut preparation time by 25 to 35 percent. Colorado State University Extension has tested a 12 to 24 hour salted-water soak for beans in electric pressure cookers at a range of elevations, with different release times above and below 7,000 feet. The guide to deep flavor in meatless beans assumes you have the time; up here, plan for it.

Pasta, rice and grains

Pasta cooks in boiling water, so it slows down here too. Expect dried pasta to need longer than the package time, and taste rather than trust the clock. Use a big pot with plenty of water and salt it well. The pasta shapes guide matches each shape to its sauce, and the bronze-die pasta guide explains the die.

Rice, farro and other whole grains can need more water and more time at elevation; check early and often. For electric pressure cookers, Colorado State University Extension says the longer cooking time at elevation may call for 2 to 4 tablespoons more liquid, particularly for dry beans and rice. Risotto can take longer, and faster evaporation means you may need more stock than the recipe says, so keep a pan of hot stock beside it. The farro guide covers the grain itself.

Candy, caramel and syrups

Candy temperatures in a recipe written for sea level assume water boils at 212°F. As a sugar syrup cooks, water boils off and the sugar concentrates, and because water boils cooler here, each stage is reached at a lower reading. The correction is roughly two degrees Fahrenheit for every thousand feet: in Denver, subtract about ten degrees from any candy temperature. A recipe that calls for 245°F at sea level is done at about 235°F here. Ignore that and the syrup cooks past the stage you wanted, so caramels come out harder than intended. The caramel guide covers the cooking itself.

The cleaner method is to calibrate. Boil water, note the reading on your thermometer, and use the difference from 212°F as your correction for every stage. Syrups, jams and reductions also reduce faster at altitude because liquids evaporate faster, so watch them closely. Penn State Extension says maple syrup is finished about 7.5°F above the day's boiling point of water, so a sugarmaker here would finish near 209 to 210°F rather than about 219.5°F at sea level; the maple syrup guide explains more.

Baking

Lower pressure lets leavening gases expand more quickly, so a cake batter can over-rise before its structure sets. Colorado State University Extension publishes adjustments for cakes. At Denver's elevation, reduce baking powder by about an eighth of a teaspoon per teaspoon, reduce sugar by up to a tablespoon per cup, add one to two tablespoons of extra liquid per cup, and raise the oven temperature by fifteen to twenty-five degrees so the structure sets before the batter over-expands. Make one change at a time to a favorite recipe and write down what works.

Bread

Yeast dough rises faster at altitude because lower air pressure lets the gas it produces expand more. Colorado State University Extension notes that a rise that runs too fast hurts texture and flavor. Use a little less yeast, or give the dough a second rise. Expect the first rise to finish sooner than the recipe's time, and judge it by when the dough has just doubled, not by the clock.

Tea

Here is the good news. Mariage Frères recommends 95°C, or 203°F, for five minutes for its Marco Polo black tea, so Marco Polo can go into the pot straight from a Denver kettle at a full boil; the Marco Polo tea guide covers the blend itself. Green teas generally want cooler water, so let the kettle sit a few minutes first. The green tea guide has the temperatures by type of green tea.

Eggs, stock and everything that simmers

Boiled eggs take noticeably longer: Colorado State University Extension notes that a "3-minute" egg may take 5 minutes at 5,000 feet, and hard-cooked eggs need extra time too. Stock and braises need longer at a simmer, and because evaporation is faster, they may need topping up. Colorado State University Extension notes that oven temperatures are not affected by elevation, so sea-level instructions work for oven-roasted meats; a braise in the oven still loses liquid faster, so check the level.

A Denver correction sheet

The table gathers the corrections from four extension services and one tea producer into a single sheet for a kettle that boils at about 202°F. The candy, maple and oven rows are this guide's own arithmetic from the published rules. Barometric pressure moves the boiling point a little from day to day, so the boiling-water test beats any fixed number.

Pantry pieces for a mile-high kitchen

Three products connect directly to the adjustments above. Mariage Frères Marco Polo (shop Marco Polo tea) is the black tea whose producer's 203°F brewing temperature sits close to a Denver boil. Rustichella d'Abruzzo bucatini (shop Rustichella bucatini) is a hollow strand, the kind of shape to taste rather than time up here. Runamok's dark, wood-fired Vermont maple syrup (shop Runamok dark maple syrup) is the finished product of the boil described in the candy section.

The shop is at 263 Josephine Street in Cherry Creek, Denver. Products ship across the continental U.S. from theambrosianpantry.com.

See also: Cookbooks.

Sources & Further Reading

• Colorado State University Extension: High Elevation Food Preparation
• Colorado State University Extension: Cooking Beans at High Elevation Using an Electric Pressure Cooker
• Colorado State University Extension: Adjusting for Elevation When Preparing Foods in an Electric Pressure Cooker
• New Mexico State University Extension: High-Altitude Cooking and Food Safety (E-215)
• National Center for Home Food Preservation: Temperatures at which Water Boils at Different Elevations
• Utah State University Extension: Dry Beans and Peas (FN 207)
• Didinger, Cichy, Urrea, Scanlan and Thompson: The effects of elevation and soaking conditions on dry bean cooking time (2023)
• Penn State Extension: Maple Syrup Production
• Mariage Frères: Marco Polo black tea
• Denver Public Library: Colorado State Capitol