When to Plant Cilantro in Iowa (2026 Guide)
Cilantro (Coriandrum sativum) is a versatile herb beloved in a variety of cuisines, including Mexican and Indian dishes. For those planning to grow cilantro in Iowa, understanding the local frost dates and climate conditions is essential. In Zone 6a, the median last spring frost is around April 25, while in Zone 6b, it's even earlier on April 14. Knowing when these dates fall helps you maximize your harvest and enjoy fresh cilantro in your kitchen.
With a frost-free season of approximately 164 days in Zone 6a and 188 days in Zone 6b, timing your cilantro planting is critical. Cilantro bolts quickly in warm weather, which is a major consideration for Iowans experiencing fluctuating temperatures in spring and summer. For those in cities like Des Moines and Cedar Rapids, careful planning ensures a consistent supply of flavorful leaves with minimal waste.
Cilantro grows best in the cooler temperatures of spring and fall. To keep your cilantro thriving, consider direct sowing every 2 to 3 weeks throughout the cooler months. This will help you avoid the quick bolting that can occur when plants face heat and long days. By understanding these factors and adhering to the recommended planting times, you can enjoy a bountiful cilantro harvest all season long.
Planting Schedule by USDA Zone in Iowa
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Not recommended — direct sow only | Not recommended — direct sow only | Start March 1 – April 15, ~6–8 weeks before April 25 | April 25 – May 31 and again September 1 – October 6 |
| Zone 6b | Not recommended — direct sow only | Not recommended — direct sow only | Start February 15 – March 30, ~6–8 weeks before April 14 | April 14 – June 1 and again September 1 – October 19 |
Cilantro Planting Windows in Iowa
- Indoor start: Indoor starting of cilantro is not recommended, so aim to sow directly outdoors from late February to April.
- Transplant outdoors: Transplanting cilantro outdoors is not recommended; direct sow should occur from early March to mid-April.
- Harvest: Cilantro can be harvested from late April until early June, and again from early September through mid-October.
Common Mistakes Growing Cilantro in Iowa
- Many Iowa gardeners attempt to start cilantro indoors, thinking it will give them a jump on the season, but this is a major mistake. Cilantro has a taproot that is sensitive to transplanting, so it's best sown directly in the soil.
- Cilantro bolts rapidly in the heat of summer, a frequent affliction in Iowa's humid climate. Be mindful of succession planting every few weeks in the cooler months to maintain a steady harvest and avoid waste due to bolting.
- Some gardeners in Iowa overlook the significance of the frost dates, planting too late in the spring. To achieve maximum growth, be sure to plant cilantro before the median last frost date of April 25 in Zone 6a and April 14 in Zone 6b.
- Avoid crowding cilantro plants too close together as they can compete for resources. This is especially pertinent in Iowa where humidity can promote fungal diseases, making air circulation vital to healthy plants.
- It's a common misconception that bolting cilantro should always be removed. In fact, allowing some plants to bolt can encourage beneficial insects to your garden, helping combat pests naturally. This can be especially helpful in Iowa where pest control can be a challenge.
Frequently Asked Questions
What if I'm in a cold pocket of Iowa?
If you're in a colder area, it’s important to adjust your planting schedule. Consider starting your cilantro as soon as conditions allow for direct sowing, typically by the end of April, to avoid the risk of a late frost.
Can I still plant cilantro in May?
Yes, you can plant cilantro in May, but be cautious about the heat as your plants may bolt sooner. Make sure to water regularly and consider shading them during the hottest days to extend their growing season.
How often should I plant cilantro for a continuous harvest?
For a steady supply, sow small batches of cilantro every two to three weeks, starting in early spring. This allows you to harvest fresh cilantro before they start bolting during peak summer temperatures.
What happens if my cilantro bolts?
If your cilantro bolts, don’t remove the plants immediately. Let them flower to attract beneficial insects, and allow the seeds to drop for new plants in the following season.
Is cilantro difficult to grow in Iowa?
Cilantro can be a bit tricky in Iowa's climate due to its sensitivity to heat and humidity, but with proper timing and care, it can be successfully grown. Focus on direct sowing during the cool seasons for the best results.
Keep Learning
City guides in Iowa
Other crops in Iowa
Typical fall sowing window for Cilantro in Iowa: July 20 – August 10.