When to Plant Rutabaga in Mahnomen County, MN
Your May planting checklist for Mahnomen County, Minnesota
May is a pivotal month for Mahnomen County, Minnesota gardens. Focus on these tasks first and you'll set up the rest of the season for success.
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Scatter rutabaga into prepared beds
Mark the row. Birds and stray feet both have opinions about unmarked beds.
Rutabagas are a cross between turnips and cabbage, producing large yellow-fleshed roots with a sweet, mild flavor. They are excellent mashed, roasted, or in stews.
Mahnomen County, Minnesota is in USDA Zone 4a. The average last spring frost is May 13 and the first fall frost is September 27, giving you a growing season of approximately 137 days.
At an elevation of 1,223 feet, Mahnomen County receives approximately 33.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 80°F, so choose short-season varieties of Rutabaga to ensure they mature before fall.
Mahnomen County Soil Profile
Soil Type
Silt Loam
Soil pH
5.9-7
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 Mahnomen County
How your county's soil matches Rutabaga's growing requirements.
Soil pH
Your soil pH (5.9–7.0) overlaps with Rutabaga's range (6.0–7.5), though not a perfect match.
Soil Texture
The silt loam soil in Mahnomen County is excellent for Rutabaga — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Rutabaga.
Organic Matter
Organic matter is excellent (4.0%) — Rutabaga will thrive.
How to Plant Rutabaga
Fall planting: Sow 12 weeks before your first frost date for a fall harvest.
Plant Water Budget
Monthly Watering Guide for Rutabaga
Rutabaga needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Rutabaga Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.5" | 0" | ❄️ Dormant |
| Mar | — | 2.2" | 0" | ❄️ Dormant |
| Apr | — | 2.9" | 0" | ❄️ Dormant |
| May | 3" | 4.3" | 0" | ✅ Rainfall sufficient |
| Jun | 3" | 3.8" | 0" | ✅ Rainfall sufficient |
| Jul | 3" | 3.7" | 0" | ✅ Rainfall sufficient |
| Aug | 3" | 3.6" | 0" | ✅ Rainfall sufficient |
| Sep | 3" | 3.1" | 0" | ✅ Rainfall sufficient |
| Oct | — | 2.4" | 0" | ❄️ Dormant |
| Nov | — | 2.4" | 0" | ❄️ Dormant |
| Dec | — | 2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Sep in Mahnomen County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Rutabaga 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.
Rutabaga Planting Timeline — Mahnomen County, MN
Rutabaga Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | May 6 | May 6 – May 27 |
| Harvest | July 29 | Jul 29 – Sep 2 |
| Fall Sowing | July 5 | Jul 5 – Jul 19 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Direct Sow |
| June | — |
| July | Fall Sowing Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.7"/week · Natural rainfall sufficient
📅 Days to Maturity
80–100 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 4a
📆 Growing Season
137 days in Mahnomen County
Growing Tips for Rutabaga in Mahnomen County
Direct sow Rutabaga outdoors after May 13 in Mahnomen County when soil has warmed and frost danger has passed.
Common pests for Rutabaga in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in early summer for fall harvest. Thin seedlings to 6-8 inches apart. Flavor improves significantly after a few light frosts.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Rutabaga in Other Locations
Frequently Asked Questions
When should I plant Rutabaga in Mahnomen County, MN?
Mahnomen County is in Zone 4a with an average last frost of May 13. Plan your Rutabaga planting based on this frost date — see the calendar above for exact timing.
What planting zone is Mahnomen County, MN?
Mahnomen County, Minnesota is in USDA Hardiness Zone 4a. The average last spring frost is May 13 and first fall frost is September 27.
Your Mahnomen County Garden Planner — Free
A 24-page printable planner built for Mahnomen County (Zone 4a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.