Crocus in Zone 3a & 3b
Crocus spp.
Yes, crocus grows in zones 3a and 3b. Plant it outside in Sep–Nov. For a fall crop, plant out in Sep–Nov.
When to plant crocus in zone 3b
Zones 3a and 3b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Window | Fall window |
|---|---|
| Start indoors | Not typically started indoors |
| Direct sow / transplant outside | Sep–Nov |
| Estimated bloom | ~150 days after direct-sowing |
Spacing: 12 per square foot (square-foot-gardening spacing). Mature height: 3-6 in.
Zone 3b dates sourced from www.longfield-gardens.com.
Fall window: the last sowing date is the average first frost minus days to maturity, the method in Purdue Extension's fall garden guide, which lists crocus for late-summer planting.
Plant alongside it in zone 3b
These go outside within two weeks of crocus in zone 3b, so one planting day can cover them.
- Daffodil (Narcissus)Sep–Nov
- Ornamental AlliumSep–Nov
- TulipSep–Oct
Crocus is grown from a corm, not a bulb, and it's usually the very first thing to bloom in the garden, sometimes pushing up through late snow in early spring, weeks before daffodils or tulips get going. The whole plant is small, just 3 to 6 inches, with cup-shaped blooms in purple, yellow, or white.
How crocus fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Crocus goes in during the fall and grows through the winter, so it isn't limited by this window: expect first bloom about 150 days after planting.
Crocus planting windows in every zone
Zone 3b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 3a & 3bFall window (your zone) | Not usually | Sep–Nov | ~150 days after direct-sowing |
| 4a & 4bFall window | Not usually | Sep–Nov | ~150 days after direct-sowing |
| 5a & 5bFall window | Not usually | Sep–Nov | ~150 days after direct-sowing |
| 6a & 6bFall window | Not usually | Sep–Nov | ~150 days after direct-sowing |
| 7a & 7bFall window | Not usually | Sep–Nov | ~150 days after direct-sowing |
| 8a & 8bFall window | Not usually | Sep–Nov | ~150 days after direct-sowing |
Bloom dates are about 150 days after the sow or plant-out date.
Good companions
No well-established companions for crocus.
Where to buy crocus bulbs
We haven't vetted bulb/tuber suppliers yet. Our seed-supplier list below doesn't carry these. The growing-guide source cited above is a good starting point for where to buy.
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See it growing
Search YouTube for "growing crocus" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 3b calendar · Plan your beds in the Garden Designer →
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Growing Crocus in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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