Carrot planting guide

When to plant carrots

Plant carrot seeds directly in the garden during cool weather. Check both your usual last spring frost and the measured soil temperature; your USDA Zone alone cannot provide either one.

Calendar anchor

2-3 weeks before frost

Count backward from the average last spring frost date.

Minimum soil temperature

40°F

Do not use the calendar window without checking the soil.

Best germination

55-65°F

The source lists 14-21 days for emergence.

Succession interval

Every 4 weeks

Repeat through midsummer when local heat allows.

Outdoor planting window

Check the calendar and the soil

Utah State University Extension supports sowing 2-3 weeks before the last frost, but only after soil reaches 40°F. The two checks are not interchangeable.

Calendar input

Use a local frost estimate

The reviewed Utah guide recommends planting 2-3 weeks before the last frost. Use our frost calculator to choose a middle estimate or a more cautious date for your area.

Estimate my last spring freeze

Condition input

Measure soil before sowing

The source says carrots can be sown once soil reaches 40°F and germinate best at 55-65°F. Temperatures above 80°F reduce germination, so the tool does not treat warmer soil as automatically better.

Seedbed and spacing checks

Plant seeds outdoors

Carrots are normally sown directly where they will grow. This page does not calculate an indoor seed-starting or transplant date.

Planting depth

Plant seed about 1/4 inch deep and keep the soil surface uniformly moist while seedlings establish.

Final spacing

Thin seedlings to 2-3 inches apart, with rows 12-18 inches apart, after plants develop 3-4 true leaves.

Soil structure

Deep, well-drained soil supports root development. Rocky, compacted or heavy soil can contribute to forked roots.

Check both conditions before sowing

A calendar window does not warm the soil. If the planting window has arrived but the soil is still below 40°F, wait and measure again before sowing.

A practical next step

Plan carrots with your local season

Cool-season crops may grow before the last spring frost or after summer heat fades. Use crop-specific soil and temperature guidance too.

1. Local dates
Find spring and fall frost dates
See historical 32°F freeze estimates and the matched NOAA station for your ZIP Code.
2. Season length
Estimate the frost-date growing window
Compare cautious, middle and less-cautious spring/fall date pairs.
3. Harvest timing
Estimate maturity from your seed packet
Use the starting point printed on your seed packet; days to maturity can count from sowing, emergence or transplanting.