Saffron Crocus in Zone 5a & 5b
Crocus sativus
When to plant saffron crocus in zone 5b
Zones 5a and 5b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Saffron Crocus doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Dec 21–Dec 28 |
| Estimated bloom | Dec 21 '27–Dec 28 '27 (~365 days after direct-sowing) |
Spacing: 9 per square foot (square-foot-gardening spacing). Mature height: 4-10 in.
Saffron crocus is the genuine source of culinary saffron, the world's most expensive spice by weight, grown here from fall-planted corms rather than seed.
How saffron crocus fits zone 5's season
Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. Saffron Crocus needs about 365 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Saffron Crocus.
Where to buy saffron crocus seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing saffron crocus" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 5b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Saffron Crocus in USDA zone 5b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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