When to Plant Jostaberry in Marinette County, WI
Jostaberry is a thornless hybrid of black currant and gooseberry, producing medium-sized, dark berries with a complex, tart-sweet flavor. It is vigorous and disease-resistant.
Marinette County, Wisconsin is in USDA Zone 4b. The average last spring frost is May 18 and the first fall frost is October 1, giving you a growing season of approximately 136 days.
At an elevation of 782 feet, Marinette County receives approximately 31.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Jostaberry to ensure they mature before fall.
Marinette County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-7.3
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
Jostaberry Planting Timeline — Marinette County, WI
Jostaberry Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | June 15 | Jun 15 – Jun 29 |
· 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
Partial Shade (3-6 hours)
Water
Moderate — regular watering
Days to Maturity
730–1095 days
Soil pH
6 – 6.5
USDA Zone
Zone 4b
Growing Season
136 days
Growing Tips for Marinette County
Plant in rich, well-drained soil. No special pruning required beyond removing old wood. Self-fertile but yields improve with a second bush. Berries ripen midsummer.
Companion Planting
Good Companions
Level Up Your Garden
Jostaberry in Other Locations
Frequently Asked Questions
When should I plant Jostaberry in Marinette County, WI?
Marinette County is in Zone 4b with an average last frost of May 18. Plan your Jostaberry planting based on this frost date — see the calendar above for exact timing.
What planting zone is Marinette County, WI?
Marinette County, Wisconsin is in USDA Hardiness Zone 4b. The average last spring frost is May 18 and first fall frost is October 1.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Marinette County gardeners in Zone 4b organize planting dates, track what's growing, and never miss a planting window.
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