Minnehaha County, SD Extension Office & Soil Testing Directory
Welcome to the official directory resource for Minnehaha County, SD. Connecting local homeowners, urban gardeners, and commercial growers with South Dakota's land-grant university extension resources, state soil testing lab services, and Master Gardener volunteer clinics.
1. Extension Office Contact Details & Operational Hours
The SDSU Extension - Sioux Falls Regional Center serves as the primary educational extension center in Minnehaha County. Visit or call during standard operational hours for agricultural advice, soil sample kits, and youth 4-H programs.
| Official Office Name: | SDSU Extension - Sioux Falls Regional Center |
| Physical Address: | 2001 E. 8th Street, Suite 101, Sioux Falls, SD 57103 |
| Direct Phone Desk: | (605) 782-3290 |
| Email Contact: | siouxfalls.center@sdstate.edu |
| Office Hours: | Monday – Friday: 8:00 AM – 5:00 PM |
| Official Web Portal: | https://extension.sdstate.edu/ |
2. Official Soil Testing Laboratory & Pricing
Testing your soil is the single most important step before adding fertilizers or agricultural lime. The official testing laboratory serving Minnehaha County is SDSU Recommended Partner Soil Testing Labs.
| Official Testing Lab: | SDSU Recommended Partner Soil Testing Labs |
| Lab Location: | Submittal forms at Sioux Falls center |
| Routine Sample Fee: | $15 routine soil sample |
| Expected Turnaround: | 5 to 7 business days |
| Official Lab Website: | https://extension.sdstate.edu/ |
How to Collect and Submit a Soil Sample in Minnehaha County:
- Pick up a Soil Kit: Pick up official sample boxes and submittal forms at the SDSU Extension - Sioux Falls Regional Center (2001 E. 8th Street, Suite 101, Sioux Falls, SD 57103).
- Collect Sub-Samples: Use a clean stainless steel trowel to take 10 to 12 soil cores from a 4-to-6-inch depth across your garden or lawn area.
- Air-Dry: Mix sub-samples in a clean plastic bucket and air-dry on clean paper at room temperature (never use an oven).
- Submit Sample: Return your filled soil box to the extension office or mail directly to SDSU Recommended Partner Soil Testing Labs.
3. Master Gardener Volunteer Program & Plant Clinic
The Minnehaha Master Gardeners provides free plant disease diagnostics, lawn care advice, and eco-friendly pest management tips.
| Program Name: | Minnehaha Master Gardeners |
| Plant Clinic Hours: | Monday & Wednesday: 10:00 AM – 1:00 PM (Note: Plant clinics run seasonally; call office during winter months) |
| Direct Helpline Phone: | (605) 782-3290 |
| Program Portal: | https://extension.sdstate.edu/garden-yard/master-gardener-program |
Volunteer Training: SDSU Extension online & classroom training.
4. Regional Soil & Growing Snapshot for Minnehaha County
USDA Plant Hardiness Zone: Zone 4b / 5a
Natural Soil Profile: Chernozem Prairie Black Silt Loam
Popular Local Crops: Corn, soybeans, sunflowers, sweet corn, brassicas
Extension Specialist Tip: Northern Plains black soils are highly fertile; test to avoid excessive phosphorus buildup.
5. 🧮 Interactive Soil Amendment Calculator for Minnehaha County
Estimate the recommended agricultural limestone or elemental sulfur needed to adjust your garden soil pH based on local Chernozem Prairie Black Silt Loam characteristics.
📚 Recommended Extension Guides & Soil Articles
Learn more about interpreting your Minnehaha County extension soil test report and managing plant nutrients:
Frequently Asked Questions (Minnehaha County Directory)
The SDSU Extension - Sioux Falls Regional Center is located at 2001 E. 8th Street, Suite 101, Sioux Falls, SD 57103. You can call their main desk directly at (605) 782-3290 during standard business hours (Monday – Friday: 8:00 AM – 5:00 PM).
Standard soil analysis for Minnehaha County garden samples through SDSU Recommended Partner Soil Testing Labs costs $15 routine soil sample. Check with the office for special sample types.
You can reach the Minnehaha Master Gardeners hotline by calling (605) 782-3290 during plant clinic hours (Monday & Wednesday: 10:00 AM – 1:00 PM).
Minnehaha County falls primarily within USDA Plant Hardiness Zone 4b / 5a. Local soil is characterized as Chernozem Prairie Black Silt Loam.
Written & Verified by Sahajul
Verified Author & Founder
Sahajul is an independent agricultural data researcher based in India and founder of LocalSoilLab.com. He specializes in compiling, structuring, and verifying US land-grant university extension services, soil lab testing fee schedules, and county Master Gardener contact directories directly from official .edu and USDA NIFA portals.