When to Plant Blueberries in Clearwater County, MN
Your May game plan for Clearwater County, Minnesota
A quick May briefing for Clearwater County, Minnesota gardeners — what's urgent, what's next, and what can wait.
Looking ahead to June
- Transplants going out: blueberries
Blueberries are long-lived shrubs producing sweet, antioxidant-rich berries. They require acidic soil and are attractive ornamental plants with fall color and spring flowers.
Clearwater County, Minnesota is in USDA Zone 3b. The average last spring frost is May 15 and the first fall frost is September 28, giving you a growing season of approximately 136 days.
At an elevation of 1,074 feet, Clearwater County receives approximately 33.7 inches of rainfall annually with predominantly silt loam soil. Summer highs average 80°F, so choose short-season varieties of Blueberries to ensure they mature before fall.
Clearwater County Soil Profile
Soil Type
Silt Loam
Soil pH
6.2-7.2
Drainage
Well Drained
Plant 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 Clearwater County
How your county's soil matches Blueberries's growing requirements.
Soil pH
Your soil pH (6.2–7.2) is more alkaline than Blueberries prefers (4.5–5.5). Add sulfur or peat moss to lower pH.
Soil Texture
The silt loam soil in Clearwater County is excellent for Blueberries — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Blueberries.
Organic Matter
Organic matter is excellent (4.6%) — Blueberries will thrive.
How to Plant Blueberries
How Much Blueberries to Grow
For a family of 4, plant approximately 8 blueberries plants in about 192 sq ft. In Clearwater County's 136-day season, you'll have plenty of time for a full harvest. Plan your garden layout →
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Blueberries
Blueberries needs approximately 1.2 inches of water per week (5.2" per month). Here's how your county's rainfall compares month by month.
| Month | Blueberries Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | — | 1.4" | 0" | ❄️ Dormant |
| Mar | — | 2.1" | 0" | ❄️ Dormant |
| Apr | — | 2.8" | 0" | ❄️ Dormant |
| May | 5.2" | 4.2" | 1" | 💧 Light watering |
| Jun | 5.2" | 3.8" | 1.4" | 💧 Light watering |
| Jul | 5.2" | 3.6" | 1.6" | 💧 Light watering |
| Aug | 5.2" | 3.8" | 1.4" | 💧 Light watering |
| Sep | 5.2" | 3.3" | 1.9" | 💧 Light watering |
| Oct | — | 2.5" | 0" | ❄️ Dormant |
| Nov | — | 2.6" | 0" | ❄️ Dormant |
| Dec | — | 2.1" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Sep in Clearwater County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Blueberries 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.
Blueberries Planting Timeline — Clearwater County, MN
Blueberries Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | June 12 | Jun 12 – Jun 26 |
· 48" apart · Rows 72" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | Transplant Outdoors |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.2"/week · 1-2 times/week
📅 Days to Maturity
730–1095 days
🧪 Soil pH
Needs 4.5–5.5 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 3b
📆 Growing Season
136 days in Clearwater County
Growing Tips for Blueberries in Clearwater County
Direct sow Blueberries outdoors after May 15 in Clearwater County when soil has warmed and frost danger has passed.
Your 136.0-day growing season in Clearwater County is tight for Blueberries (730.0-1095.0 days to maturity). Start indoors and choose early-maturing varieties.
General growing tips
Plant at least two varieties for cross-pollination. Acidify soil with sulfur or pine needle mulch to maintain pH 4.5-5.5. Protect ripening berries from birds with netting.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Blueberries in Other Locations
Frequently Asked Questions
When should I plant Blueberries in Clearwater County, MN?
Clearwater County is in Zone 3b with an average last frost of May 15. Plan your Blueberries planting based on this frost date — see the calendar above for exact timing.
What planting zone is Clearwater County, MN?
Clearwater County, Minnesota is in USDA Hardiness Zone 3b. The average last spring frost is May 15 and first fall frost is September 28.
Your Clearwater County Garden Planner — Free
A 24-page printable planner built for Clearwater County (Zone 3b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.