📍 Bailey, CO · Zone 5b · Last frost Saturday, April 25, 2026
✏️ ChangeWhen to Plant Marigold in Bailey, Colorado (80421)
Location
Bailey, Colorado
ZIP Code
80421
USDA Zone
5b
Last Frost
Saturday, April 25, 2026
📅 Your 2026 Planting Dates
Start Seeds Indoors
Saturday, March 14, 2026
Transplant Outdoors
Saturday, May 9, 2026
Based on last frost Saturday, April 25, 2026 · Zone 5b
Pro tip: Start Marigold seeds indoors 6 weeks before your last frost date, then transplant outdoors around Saturday, May 9, 2026.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Full Sun (6-8 hours)
💧
Water
Moderate (1 inch/week)
↔️
Spacing
12" apart
🌱
Planting Depth
0.25" deep
Seeds typically germinate in 5-10 days
Ready to Plant Marigold in Bailey?
Get your seeds now so they're ready by Saturday, March 14, 2026.
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🤝 Good Companions
Full Companion Planting Guide for Marigold
See which plants help Marigold thrive, which to keep away, and raised bed layout tips →
🛠️ Supplies You'll Need
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Common Marigold Varieties
Popular cultivars to look for at your local nursery or seed supplier.
French Marigold (Dainty Marietta)
Small, prolific marigold with bicolor yellow-red blooms on compact 10-inch plants.
African Crackerjack
Tall African marigold with huge 3–4 inch pompom flowers in gold, orange, and yellow.
Signet (Gem Series)
Edible, citrus-scented single blooms on lacy foliage; excellent in salads and as a garnish.
Vanilla
Unique creamy-white African marigold; novel color that stands out in any garden bed.
Safari Mix
Compact French marigold mix with early blooms; excellent container and edging plant.
Common Marigold Problems
What to watch for — and how to fix it before it spreads.
Pests
Common in hot, dry conditions; cause bronzed, stippled leaves and fine webbing.
Increase humidity; spray with insecticidal soap or neem oil; avoid dusty conditions.
Chew ragged holes in young transplants and seedlings overnight.
Apply diatomaceous earth; use beer traps; water in the morning to keep soil dry at night.
Diseases
Gray fuzzy mold on flowers and stems in cool, wet conditions; petals turn brown and mushy.
Remove spent blooms promptly; improve airflow; avoid wetting flowers when irrigating.
White powdery coating on leaves; worse in humid weather with poor airflow.
Space plants adequately; apply potassium bicarbonate; choose resistant varieties.
Phytoplasma spread by leafhoppers causes distorted, yellowed growth and malformed flowers.
Remove and destroy infected plants; control leafhopper populations with row covers.
Common Mistakes
Spent blooms left on the plant signal it to stop flowering and focus on seed production.
Remove dead flowers weekly to extend the blooming season into fall frost.
Marigolds transplant poorly if root-bound; young transplants actually do better.
Start 4–6 weeks before last frost (not earlier); or direct-sow after frost — they grow fast.
🌾 Seed Saving Guide
🟢 EasyWhen to Harvest Seed
Allow flower heads to dry completely on the plant until the petals are papery and brown.
Processing
Pull seeds (needle-like slivers at base of petals) from dried heads, dry 1 week before storing.
Seed Viability
Up to 2 years when stored cool, dark, and dry.
Pro Tip
French marigolds (T. patula) are often OP. African marigolds (T. erecta) can be hybrid — check variety before saving.
Raised Bed Planting Guides
A 4×8 bed fits 32 plants of Marigold. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Marigold in Bailey, Colorado? +
In Bailey (Zone 5b), start Marigold seeds indoors around Saturday, March 14, 2026 and transplant outdoors around Saturday, May 9, 2026.
What is the last frost date for Bailey, Colorado? +
The average last spring frost date for Bailey, Colorado (ZIP 80421) is around Saturday, April 25, 2026. This is based on NOAA climate normals for USDA Zone 5b.
How long does Marigold take to grow? +
Marigold typically matures in about 50 days from transplanting. In Bailey, that means you can expect harvest around Saturday, May 9, 2026 plus 50 days.
Should I start Marigold indoors or direct sow in Colorado? +
Marigold should be started indoors 6 weeks before your last frost date. In Bailey, that means starting around Saturday, March 14, 2026.
📚 More Marigold Planting Guides
Other Plants for Bailey
Growing Marigold in Zone 5b
Marigold (Tagetes patula) is a popular garden vegetable. In Bailey, Colorado, which is in USDA Hardiness Zone 5b, you should start seeds indoors around Saturday, March 14, 2026.
Your average last frost date is Saturday, April 25, 2026. Plan to transplant your Marigold seedlings outdoors around Saturday, May 9, 2026, about 2 weeks after your last frost date.