When to Plant Watercress in Nobles County, MN
Watercress is a semi-aquatic plant with a peppery, tangy flavor rich in vitamins and minerals. It grows naturally along streams and can be cultivated in containers with standing water.
Nobles County, Minnesota is in USDA Zone 4b. The average last spring frost is May 2 and the first fall frost is October 2, giving you a growing season of approximately 153 days.
At an elevation of 553 feet, Nobles County receives approximately 39.2 inches of rainfall annually with predominantly silt loam soil. Summer highs average 80°F, so choose short-season varieties of Watercress to ensure they mature before fall.
Nobles County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-7.1
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.
Plant Water Budget
Watercress Planting Timeline — Nobles County, MN
Watercress Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 21 | Mar 21 – Apr 4 |
| Transplant Outdoors | May 2 | May 2 – May 16 |
| Direct Sow | April 25 | Apr 25 – May 16 |
| Fall Sowing | July 10 | Jul 10 – Jul 24 |
| Harvest | June 13 | Jun 13 – Jul 18 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Fall Sowing Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Partial Shade (3-6 hours)
Water
High — keep soil consistently moist
Days to Maturity
40–60 days
Soil pH
6.5 – 7.5
USDA Zone
Zone 4b
Growing Season
153 days
Growing Tips for Nobles County
Grow in containers with trays of water kept fresh. Provide partial shade and cool conditions. Harvest stems by cutting above water level. Replace water frequently to prevent stagnation.
Companion Planting
Good Companions
Level Up Your Garden
Watercress in Other Locations
Frequently Asked Questions
When should I plant Watercress in Nobles County, MN?
Nobles County is in Zone 4b with an average last frost of May 2. Plan your Watercress planting based on this frost date — see the calendar above for exact timing.
What planting zone is Nobles County, MN?
Nobles County, Minnesota is in USDA Hardiness Zone 4b. The average last spring frost is May 2 and first fall frost is October 2.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Nobles County gardeners in Zone 4b organize planting dates, track what's growing, and never miss a planting window.
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