When to plant Crocus in Logan County, CO
Plant Crocus in Logan County after May 11; the prime window is mid-spring–late spring. A second sowing from August 24 to September 7 extends the harvest into fall.
When to Plant Crocus in Logan County, CO
What to do in July
July rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Logan County, Colorado.
A few tasks this July that'll pay off in August
- Fall sowing: crocus
Crocuses (Crocus spp.) are the heralds of spring — small, gem-like blooms that push up through frozen ground or even snow, often weeks before any other flower. Their compact corms naturalize readily in lawns, rock gardens, and borders, creating drifts of purple, white, and yellow that expand year after year. Bees prize early crocus as one of their first nectar and pollen sources of the season. The saffron crocus (C. sativus) blooms in fall and yields the world's most expensive spice.
Logan County, Colorado is in USDA Zone 5b. The average last spring frost is May 11 and the first fall frost is October 5, giving you a growing season of approximately 147 days.
At an elevation of 6,511 feet, Logan County receives approximately 14.9 inches of rainfall annually with predominantly loam soil. Summer highs average 83°F, so choose short-season varieties of Crocus to ensure they mature before fall. With low rainfall, drip irrigation is essential for growing Crocus successfully. Mulch heavily to conserve soil moisture.
Logan County Soil Profile
Soil Type
Loam
Soil pH
6.4-7.9
Drainage
Well Drained
Crocus Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Logan County
How your county's soil matches Crocus's growing requirements.
Soil pH
Your soil pH (6.4–7.9) is more alkaline than Crocus prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
The loam soil in Logan County is excellent for Crocus — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Crocus.
How to Plant Crocus
Fall planting: Sow 6 weeks before your first frost date for a fall harvest.
Succession Planting Crocus
Sow every 1.1 weeks. Last sowing by Sep 15 to harvest before frost.
For a dedicated fall crop, sow by Aug 24.
Crocus Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Crocus
Crocus needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Crocus Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1" | 0" | ❄️ Dormant |
| Feb | — | 0.9" | 0" | ❄️ Dormant |
| Mar | — | 1.1" | 0" | ❄️ Dormant |
| Apr | — | 1.6" | 0" | ❄️ Dormant |
| May | 2.2" | 1.7" | 0.5" | 💧 Light watering |
| Jun | 2.2" | 1.2" | 1" | 💧 Light watering |
| Jul | 2.2" | 1.3" | 0.9" | 💧 Light watering |
| Aug | 2.2" | 1.5" | 0.7" | 💧 Light watering |
| Sep | 2.2" | 1.3" | 0.9" | 💧 Light watering |
| Oct | 2.2" | 1.3" | 0.9" | 💧 Light watering |
| Nov | — | 1.1" | 0" | ❄️ Dormant |
| Dec | — | 1" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Oct in Logan County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Crocus Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Crocus Planting Timeline — Logan County, CO
Crocus Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Bloom | July 6 | Jul 6 – Jul 27 |
| Fall Sowing | August 24 | Aug 24 – Sep 7 |
Plant 4" deep · 3" apart · Rows 4" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | — |
| July | Bloom |
| August | Fall Sowing |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Only during dry spells
📅 Days to Maturity
10–20 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 5b
📆 Growing Season
147 days in Logan County
Growing Tips for Crocus in Logan County
Direct sow Crocus outdoors after May 11 in Logan County when soil has warmed and frost danger has passed.
Your generous 147.0-day season in Logan County allows multiple plantings of Crocus. Sow every 5.0 days for continuous harvest.
Logan County receives only 15" of rain annually. Crocus needs consistent moisture — install drip irrigation or water deeply 2-3 times per week.
General growing tips
Plant corms 3–4 inches deep and 2–3 inches apart in fall, when soil temperature drops below 60°F. Mass plantings (at least 25 corms per cluster) create the most visual impact. Plant in well-drained soil — corms rot in standing water. Crocus naturalize well under deciduous trees; the tree leafs out after crocus dormancy begins, so light competition is minimal. Squirrels and chipmunks dig corms — plant deeper (4 inches) or use wire mesh baskets in high-predation areas. Allow foliage to die back naturally before mowing lawns. In zones 8a–8b, plant in December with pre-chilled corms for best results.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Crocus in Other Locations
Frequently Asked Questions
When should I plant Crocus in Logan County, CO?
Logan County is in Zone 5b with an average last frost of May 11. Plan your Crocus planting based on this frost date — see the calendar above for exact timing.
What planting zone is Logan County, CO?
Logan County, Colorado is in USDA Hardiness Zone 5b. The average last spring frost is May 11 and first fall frost is October 5.
When should I plant Crocus in Logan County, CO?
In Logan County, CO, plant Crocus after the last frost (around May 11) and before the first frost (around October 5). Best results when soil holds above 50°F.
What growing zone is Logan County, CO for Crocus?
Logan County sits in USDA Zone 5b. Crocus grows reliably in zones 3a through 8b, so it's a good fit here.
Can Crocus grow in Logan County's climate?
Yes — Crocus grows well in Logan County's temperate climate. Logan County averages a 147-day frost-free season, with last frost around May 11 and first frost around October 5.
Your Logan County Garden Planner — Free
A 22-page printable planner built for Logan County (Zone 5b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.