Gardening in Nevada: zones, frost dates and when to plant

High desert north, low desert south

Most of Nevada is a high plateau cut by north–south mountain ranges. The Western Regional Climate Center puts the eastern part of the state mostly between 5,000 and 6,000 feet and the western part, around Reno and Carson City, between 3,800 and 5,000 feet. The south sits much lower, mostly 2,000 to 3,000 feet, and drops below 1,000 feet along the Colorado River.

Those elevations produce three broad garden climates. In the northeast, around Elko and Ely, summers are short and hot and winters are long and cold. The west has similarly short, hot summers but only moderately cold winters. The south has long, hot summers and short, mild winters. Across the north and center, freezes start early in fall and last late into spring. The far south has a much longer freeze-free season. Check the frost dates for your city above. Your local frost dates matter more than any statewide average.

Two conditions apply almost everywhere. The Sierra Nevada blocks Pacific moisture, so valleys and deserts average only about 9 inches of rain a year. The dry air also gives Nevada big daily temperature swings, often 30 to 35 degrees between afternoon high and overnight low.

Northern Nevada: three short seasons

University of Nevada Extension’s fact sheet Getting Started with a Vegetable Garden is written for the Reno area. It describes three growing seasons: early spring, summer and early fall. St. Patrick’s Day is the traditional start. Peas and spinach go in then. About a month later you can direct-seed lettuce, Swiss chard, beets and carrots, and keep sowing them through May. Warm-season transplants such as tomatoes, peppers, eggplant, squash and watermelon wait until frost danger has passed. A second round of cool-season crops can start in August. Garlic does best planted in fall.

The fact sheet gives several more timing points:

• Cabbage-family crops dislike heat. Don’t plant them after mid-May.
• Start tomatoes, peppers and other frost-tender crops indoors from mid-March to mid-April.
• Hotcaps or row covers let you set transplants out earlier.
• The north valleys average 5 to 10°F colder than Reno, so delay planting there by one to two weeks.
• Frost dates vary a lot from year to year. Plan on a frost-free period of about 90 days to be safe.

Drip irrigation is the usual method in the region because it puts water at the roots and loses less to evaporation.

Southern Nevada: plant around the heat

In the Las Vegas Valley the calendar flips. Extension’s Becoming a Desert Gardener notes that about 97 days a year top 100°F. Above 95°F, vegetables largely stop producing leaves, flowers and fruit, though they still need regular water. Its Southern Nevada planting guide gives most cool-season crops two windows, from February into March and again from August into early October. Tomatoes, peppers, squash and melons start in mid-March. Tomatoes can be planted until late May.

The Fall Gardening Checklist for Southern Nevada calls fall an often-forgotten planting season with fewer weeds, insects and diseases. Late-summer heat dries seedbeds fast, so the checklist suggests:

• Soak large seeds overnight.
• Sow small seeds a quarter inch deeper and large seeds a half inch deeper than in spring.
• Water three to four times a day until seedlings emerge.
• Cover rows with straw and pull it back as seedlings come up.

Cool-season crops still need at least six hours of sun, but they should be shaded from the hottest afternoon sun.

Salt, caliche and wind

Southern Nevada soils are high in salts and alkali and have almost no organic matter. Many also contain caliche, a lime-cemented hardpan that blocks drainage. Extension says vegetables are easier to grow in raised beds amended with compost. For in-ground beds, the fall checklist recommends spreading 4 to 6 inches of compost or other organic matter. Add sulfur and fertilizer, then work it all 10 to 12 inches deep. Many Las Vegas Valley soils are also high in boron. Asparagus and beets tolerate it better than most crops.

Wind is a real hazard in the south. Gusts of 70 mph can knock over young plants, and spring brings occasional dust storms. A 2025 Extension guide for Las Vegas gardeners points out that straw mulch blows around in windy weather. It also reports that drip irrigation can use 50 to 70 percent less water than conventional watering.

In the south, fix the soil before you plant. Where the soil drains freely, Extension suggests a heavy watering to leach out salts before planting, followed by compost or fertilizer to replace the nutrients that leaching removes. Use sulfur, not ammonium sulfate, to bring down high pH.