Planting Guides

When to Plant Carrots in Salt Lake City: Zone 7a Dates + Best Varieties

Salt Lake City, Utah

USDA Zone 7a

Last Frost: Apr 25

Last updated: October 30, 2025

Plant carrots in Salt Lake City from late March through late April for spring harvest. Sow fall crops in late July through mid-August for sweet roots before Zone 7a's October 15 first frost.

YYuki Tanaka

October 30, 2025

Fresh carrots harvested from a Salt Lake City Zone 7a garden with mountain backdrop — — Image © PlantReference.org 2026

Quick Answer

Sow carrot seeds outdoors late March through late April in Salt Lake City for spring harvest. Plant fall crops late July through mid-August for Zone 7a's sweetest roots.

TL;DR

Salt Lake City's Zone 7a provides a 173-day growing season between the April 25 last frost and October 15 first frost—shorter than most cities in this zone. The alkaline soil (pH 7.5-8.5), low humidity, and only 16 inches of annual rainfall make irrigation and soil amendment essential. Sow spring carrots late March through late April, then plant fall crops late July through mid-August for the sweetest roots. Daucus carota subsp. sativus 'Danvers 126' tolerates alkaline conditions, while Daucus carota subsp. sativus 'Nantes' produces exceptional flavor in amended raised beds.

Frequently Asked Questions

When should I start planting carrots in Salt Lake City?

Start sowing carrot seeds outdoors in late March, about four weeks before Salt Lake City's April 25 average last frost. Carrots tolerate frost and light freezes, so early planting is safe. Continue succession sowings through late April.

What is the best carrot variety for Salt Lake City?

Daucus carota subsp. sativus 'Danvers 126' is the most reliable variety for Salt Lake City's alkaline clay. The conical root handles heavy soil, and it shows better tolerance to high pH than most varieties.

How do I manage Salt Lake City's alkaline soil for carrots?

Test pH through the USU Extension Service—SLC soil typically runs 7.5-8.5. Carrots prefer 6.0-6.8. Apply elemental sulfur at 1-2 pounds per 100 square feet per pH point needed, working it into the top 10-12 inches. Results take weeks to months.

Why do Salt Lake City carrots taste sweeter than other cities?

Salt Lake City's elevation creates dramatic day-night temperature swings—often 30-40°F between afternoon highs and predawn lows. During the day, warm temperatures drive photosynthesis and top growth. At night, cool temperatures slow respiration, allowing sugar to accumulate in roots rather than being burned for energy. This diurnal temperature range is significantly wider than humid eastern cities and produces measurably sweeter carrots.

How much water do carrots need in Salt Lake City?

Salt Lake City receives only about 16 inches of annual rainfall—far less than carrots require. Expect to provide nearly all irrigation yourself. Carrots need 1-1.5 inches per week through drip irrigation. Overhead sprinklers lose significant water to evaporation in SLC's dry air. Budget for approximately 3-4 gallons per square foot over a full growing cycle.

Is Salt Lake City's growing season long enough for carrots?

Yes, but with less margin than most cities. The 173-day frost-free window is the shortest in this carrot series. Choose varieties at 65-75 days to maturity and time sowings precisely. Both spring and fall windows are compressed—start spring sowings by late March and fall sowings by late July. There's no room for late starts or replanting failures.

NEW PLANT DAILY

Think you know your plants?

Test your botanical knowledge with a new plant identification challenge every day. Build your streak, learn fascinating plant facts, and become a plant identification expert!

Build your streak

One chance per day

Learn as you play

Free account required • Takes less than 30 seconds

Tagged with

#carrots #Salt Lake City gardening #Zone 7a #planting guide #Danvers #alkaline soil #fall carrots #Utah vegetable garden #water-wise #Nantes

Written By

Yuki Tanaka

Yuki is a landscape designer in Salt Lake City who specializes in water-wise gardens that work with Utah's dry climate and alkaline soil. She moved to Utah from Portland, Oregon—a rude awakening for someone used to gardening in rich, acidic soil with reliable rainfall. That transition taught her to rethink everything she knew about plant selection and garden design. Yuki now focuses on intermountain-adapted plantings that combine ornamental grasses, drought-tolerant perennials, and carefully chosen shrubs for year-round interest. She works with homeowners looking to reduce water use without giving up on having an attractive garden. Yuki writes with the clarity of someone who had to learn a new climate from scratch.