When to Plant Dill in Colorado (2026 Guide)

Dill (Anethum graveolens) is a fragrant herb known for its feathery leaves and distinctive seeds, making it a beloved choice for pickling and enhancing dishes like fish and vegetables. In Colorado, the climate can vary significantly, and understanding when to plant dill is crucial for a successful harvest. With frost dates ranging from April 25 in Zone 6a to May 17 in Zone 5a, it’s essential to plan your planting accordingly.

Colorado’s diverse hardiness zones offer a variety of growing conditions. For instance, if you're in Grand Junction (Zone 6a), you can enjoy a longer growing season with a median last frost date of April 25. On the other hand, areas like Colorado Springs (Zone 5a) experience a shorter season with a last frost date around May 17, making timely planting vitally important to ensure a fruitful dill harvest.

To get the best results with dill in Colorado, it's recommended to direct sow seeds directly into the garden. Dill is a cool-season herb that thrives in the spring and fall, but it does not respond well to transplanting due to its taproot system. Therefore, knowing your local frost dates, such as October 1 for Zone 5b, helps you maximize the growing season and enjoy fresh dill all year round.

Planting Schedule by USDA Zone in Colorado

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5b	Not recommended — direct sow only	Not recommended — direct sow only	Start April 10 – May 5, after the last frost	Harvest from May 20 – October 1 for fresh dill
Zone 5a	Not recommended — direct sow only	Not recommended — direct sow only	Start April 20 – May 17, after the last frost	Harvest from June 1 – September 27 for fresh dill
Zone 6a	Not recommended — direct sow only	Not recommended — direct sow only	Start March 20 – April 25, after the last frost	Harvest from April 30 – October 16 for fresh dill

Dill Planting Windows in Colorado

Indoor start: Dill should not be started indoors due to its taproot; instead, direct sow seeds outdoors after the last frost in your zone.
Transplant outdoors: Direct sow dill seeds outdoors between April 10 and May 17, depending on your local frost date.
Harvest: Harvest dill from approximately May 20 until October 1, ensuring the best flavor and aroma.

Common Mistakes Growing Dill in Colorado

One common mistake Colorado gardeners make is underestimating late spring frosts. Even in late April and early May, sudden temperature drops can occur, so always keep an eye on forecasts before sowing dill seeds.
Another frequent error is sowing dill too late in the season. In Colorado, the cooler growing days of spring and fall are ideal for dill, and planting too close to summer heat can result in early bolting and diminished flavor.
Many gardeners in Colorado may also try to transplant dill instead of direct sowing. Due to its taproot, transplanting can hinder growth. Make sure to sow seeds directly in the garden for the best outcomes.
Improper watering practices can be detrimental to dill in Colorado's variable climate. Ensure that your soil retains moisture, particularly during hot spells, but avoid overwatering, which can lead to root rot.
Finally, neglecting to stake taller dill plants can lead to collapse during windy conditions. Colorado gardens can experience unexpected gusts, so it's advisable to provide support for your dill when necessary.

Frequently Asked Questions

Can I still plant dill in May?

Yes, if you're in a zone with a later last frost date, such as Zone 5a, you can plant dill up until May 17. Just ensure you sow after the last frost for the best results.

What if I'm in a cold pocket of Colorado?

If you're in a cooler area, like higher elevations, you may need to delay sowing dill until a safer frost date. Monitor your local temperatures closely to avoid damage to young plants.

How often should I succession plant dill?

For a continuous supply of fresh dill throughout the season, plant new seeds every 2-3 weeks, especially during the cooler spring and fall months when dill thrives best.

Is dill easy to grow in Colorado?

Dill can be easy to grow in Colorado if you follow the right planting guidelines. Make sure to direct sow it after the last frost and water it properly throughout its growing season.

When is the best time to harvest dill?

For the best flavor, harvest dill weed in the morning after the dew has dried, usually from June 1 up to the first fall frost around October 1. This will give you the freshest aromatic leaves.

Keep Learning

Typical fall sowing window for Dill in Colorado: July 7 – July 28.