When to Plant Cilantro in Wyoming (2026 Guide)

Cilantro is a flavorful herb that thrives in cool weather, making it an ideal choice for Wyoming gardeners. As a dual-purpose plant, cilantro provides both aromatic fresh leaves and seeds for culinary use. In Wyoming, understanding the specific frost dates is crucial for successful planting. For those in Zone 5a, the last spring frost typically occurs on May 27, while Zone 5b gardeners can expect it a bit earlier on May 12.

The growing season for cilantro is relatively short in Wyoming, with an approximate frost-free period of 115 days in Zone 5a and about 137 days in Zone 5b. This means you'll want to carefully time your sowing to ensure a steady harvest of this delicious herb. By sowing small amounts every 2-3 weeks during the cool season, you can keep the harvest rolling in before plants bolt in the heat of summer.

It's also important to educate yourself on the best practices for growing cilantro for optimal results. Since cilantro bolts quickly in warm temperatures, using slow-bolting varieties and managing your sowing schedule can help you enjoy fresh cilantro for a longer time. This guide is tailored for Wyoming, focusing on the specific needs of your local climate and optimizing conditions for a flavorful yields.

Planting Schedule by USDA Zone in Wyoming

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5a	Not recommended — direct sow only.	Not recommended — direct sow only.	Start April 1 – May 20, ~2–3 weeks after last frost	Harvest between June 10 – September 1, ~3–6 weeks after sowing.
Zone 5b	Not recommended — direct sow only.	Not recommended — direct sow only.	Start March 15 – May 1, ~2–4 weeks after last frost	Harvest between June 1 – September 10, ~3–6 weeks after sowing.

Cilantro Planting Windows in Wyoming

Indoor start: Cilantro should not be started indoors; it’s recommended to direct sow only.
Transplant outdoors: Direct sow cilantro outdoors from April 1 to May 20 in Zone 5a and March 15 to May 1 in Zone 5b.
Harvest: Harvest cilantro between June 10 and September 1 in Zone 5a, and between June 1 and September 10 in Zone 5b.

Common Mistakes Growing Cilantro in Wyoming

One common mistake for Wyoming gardeners is sowing cilantro too late in the season. Given the unique climate and frost dates, planting too close to the last frost can shorten your harvest window significantly.
Another mistake is overwatering cilantro. In Wyoming's drier climate, it's essential to monitor moisture levels to avoid waterlogged soil. This can lead to root rot and overall plant decline.
Failing to account for variable weather patterns can also be an issue. Late spring snows and sudden temperature drops in Wyoming may damage young cilantro plants if they aren't protected in time.
Many gardeners in Wyoming tend to neglect succession planting. Since cilantro bolts quickly, a schedule of sowing small amounts every few weeks can help ensure a steady supply of fresh cilantro throughout the growing season.
Lastly, some people think they can start cilantro indoors. However, due to its taproot and tendency to bolt after transplanting, direct sowing is a must for successful growth in Wyoming.

Frequently Asked Questions

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

If you're in a colder area, it's crucial to time your sowing carefully according to your specific local frost dates. Using mulch can also help retain warmth around your young plants.

Can I still plant cilantro in May?

Yes, you can plant cilantro in May, but ideally, you should aim to sow before the last frost date, especially for Zone 5a. Consider direct sowing seeds in early May for the best chance at a successful harvest.

How often should I sow cilantro?

To maintain a continuous supply, it's recommended to sow cilantro every 2-3 weeks during the cool season. This ensures you can enjoy fresh cilantro before the plants bolt.

Can cilantro survive light frosts?

Cilantro can tolerate light frosts, but prolonged cold exposure can damage young seedlings. If temperatures drop unexpectedly, consider covering them to protect against frost.

What should I do if my cilantro bolts?

If your cilantro bolts, don’t pull out the plants. Allow them to flower and produce seeds, which can lead to new plants next season. The flowers also attract beneficial insects to your garden.