When to Plant Mustard in Amherst, Colorado (80721)
Location
Amherst, Colorado
ZIP Code
80721
USDA Zone
5b
Last Frost
Saturday, April 25, 2026
📅 Planting Calendar
Direct Sow Outdoors Saturday, March 14, 2026
Pro Tip: Mustard can be directly sown outdoors. Plant 6 weeks before your last frost date.
🌿 Plant Details
Scientific Name Brassica juncea
Days to Maturity 56 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 1-7 days
🤝 Good Companions
CabbageCauliflowerRadishBrussel SproutTurnip
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Growing Mustard in Zone 5b
Mustard (Brassica juncea) is a popular garden vegetable. In Amherst, Colorado, which is in USDA Hardiness Zone 5b, you should direct sow seeds around Saturday, March 14, 2026.
Your average last frost date is Saturday, April 25, 2026. Mustard grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.