When to Plant Cilantro
Planting Window
- Direct sow
- ~2 weeks before last frost
| USDA Zone | Typical Window |
|---|---|
| Zone 5 and colder | April, with several successive sowings |
| Zone 6-7 | As early as March |
| Zone 8 and south | Fall through spring only |
Cilantro is a cool-season herb, genuinely frost-tolerant, and it's almost always direct-sown - like dill, its taproot resents transplanting - but the defining feature of its timing is how narrow the good-harvest window is before heat and long days push it into bolting.
Direct Sowing, Early and Repeatedly
Cilantro germinates reliably in cool soil, and there's little advantage to waiting for warmer weather the way tender herbs like basil demand - if anything, a planting pushed later into genuinely warm weather only shortens the already-narrow window before bolting sets in.
Succession Sowing Every Two to Three Weeks
Because a single sowing stays in good leaf-harvest condition for only a few weeks before bolting, sowing a small new row every two to three weeks through the cool part of the season - rather than one large planting - is close to essential for a steady supply, more so than for most herbs on this site.
Slow-Bolt Varieties Extend Either Window Somewhat
Slow-bolt cultivars like 'Slo-Bolt' or 'Calypso' extend the usable harvest window in both spring and fall sowings by a couple of weeks compared to standard cilantro, though they don't change the fundamental spring-versus-fall timing logic - they delay the eventual bolt within whichever season you're sowing rather than opening up a genuinely new planting window.
A Fall Sowing Is Often More Forgiving Than Spring
A fall-sown cilantro crop benefits from the same day-length dynamic that makes fall spinach more reliable than spring spinach - shortening days work with the plant instead of against it. Cilantro's own window stays tighter either way than spinach's does, though, since heat alone is enough to trigger cilantro's bolt even on a shortening-day schedule.
A Bolted Plant Still Yields Coriander
A cilantro planting allowed to bolt and flower produces coriander - the plant's dried seed, harvested once seed heads turn brown and papery - so a planting that's bolted past usefulness for leaf harvest isn't necessarily wasted if left to finish out for its own spice-rack seed instead.
Zone boundaries follow the USDA Plant Hardiness Zone Map (2023 revision); frost windows reflect NOAA/NCEI climate normals. Both are typical historical ranges, reviewed annually - not a forecast or a guarantee for any single year. See Methodology & Sources.
Frequently Asked Questions
How much earlier can I plant cilantro compared to basil?
Considerably earlier - cilantro is genuinely frost-tolerant and can go in weeks before your last frost date, while basil has to wait until well after frost risk has passed and nights are consistently mild, since basil is killed outright by cold that cilantro shrugs off entirely.
Is a fall planting of cilantro really more reliable than a spring one?
Often yes - since bolting is driven by both heat and lengthening daylight, a fall sowing maturing into shorter, cooler days tends to hold in good leaf condition longer than a spring sowing racing against both a warming and lengthening day at the same time.
Is it worth buying slow-bolt cilantro seed, or is succession sowing standard cilantro just as effective for a steady supply?
For most gardeners, succession sowing does more of the real work - a new short row every couple of weeks keeps young, non-bolted plants coming regardless of variety, which solves most of the "not enough fresh cilantro" problem on its own. Slow-bolt seed is a nice small edge stacked on top of that routine, worth the modest price difference, but it isn't a substitute for succession sowing if you skip that step entirely.
Can I grow cilantro in partial shade to buy extra time before it bolts?
Yes - afternoon shade in warmer climates genuinely helps delay bolting by a few days compared to full, unshaded sun, which can meaningfully stretch the usable harvest window on a marginal-timing planting without changing anything about the sowing date itself.