When to plant Shallot in Denver County, CO
Denver County gardeners should plant Shallot between April 30 and May 21 in spring. With Denver County's Zone 6a climate (last frost May 14), Shallot needs 90–120 days to mature — plant by May 29 for a full harvest. A second sowing from July 18 to August 1 extends the harvest into fall.
When to Plant Shallot in Denver County, CO
Shallots are a gourmet allium prized for their complex, sweet, and mild flavor. Each bulb multiplies into a cluster, making them easy and rewarding to grow.
Denver County, Colorado is in USDA Zone 6a. The average last spring frost is May 14 and the first fall frost is September 26, giving you a growing season of approximately 135 days.
At an elevation of 6,818 feet, Denver County receives approximately 20.5 inches of rainfall annually with predominantly loam soil. Summer highs average 85°F, providing good warmth for Shallot during the growing season.
Denver County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Shallot Planting Timeline — Denver County, CO
Shallot Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | April 9 | Apr 9 – Apr 23 |
| Transplant Outdoors | May 14 | May 14 – May 28 |
| Direct Sow | April 30 | Apr 30 – May 21 |
| Harvest | August 13 | Aug 13 – Oct 1 |
| Fall Sowing | July 18 | Jul 18 – Aug 1 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Fall Sowing |
| August | Fall Sowing Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
90–120 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6a
📆 Growing Season
135 days in Denver County
Growing Tips for Denver County
Plant sets in fall for spring harvest or early spring for summer harvest. Mulch heavily if overwintering. Harvest when tops brown and dry, then cure for storage.
Companion Planting
Good Companions
Avoid Planting Near
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Shallot in Other Locations
Frequently Asked Questions
When should I plant Shallot in Denver County, CO?
Denver County is in Zone 6a with an average last frost of May 14. Plan your Shallot planting based on this frost date — see the calendar above for exact timing.
What planting zone is Denver County, CO?
Denver County, Colorado is in USDA Hardiness Zone 6a. The average last spring frost is May 14 and first fall frost is September 26.
When should I plant Shallot in Denver County, CO?
In Denver County, CO, plant Shallot after the last frost (around May 14) and before the first frost (around September 26). Best results when soil holds above 50°F.
What growing zone is Denver County, CO for Shallot?
Denver County sits in USDA Zone 6a. Shallot grows reliably in zones 4a through 10b, so it's a good fit here.
Can Shallot grow in Denver County's climate?
Yes — Shallot grows well in Denver County's temperate climate. Denver County averages a 135-day frost-free season, with last frost around May 14 and first frost around September 26.
Your Denver County Garden Planner — Free
A 22-page printable planner built for Denver County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.