Jefferson County, CO Extension Office & Soil Testing Directory
Welcome to the official directory resource for Jefferson County, CO. Connecting local homeowners, urban gardeners, and commercial growers with Colorado's land-grant university extension resources, state soil testing lab services, and Master Gardener volunteer clinics.
1. Extension Office Contact Details & Operational Hours
The Colorado State University Extension - Jefferson County serves as the primary educational extension center in Jefferson County. Visit or call during standard operational hours for agricultural advice, soil sample kits, and youth 4-H programs.
| Official Office Name: | Colorado State University Extension - Jefferson County |
| Physical Address: | Golden, Colorado 80401 |
| Direct Phone Desk: | (080) 555-0199 |
| Email Contact: | jefferson@colostate.edu |
| Office Hours: | Monday – Friday: 8:00 AM – 4:30 PM |
| Official Web Portal: | https://agsci.colostate.edu/soiltestinglab/ |
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 Jefferson County is CSU Soil, Water and Plant Testing Laboratory.
| Official Testing Lab: | CSU Soil, Water and Plant Testing Laboratory |
| Lab Location: | 1120 Campus Delivery, Fort Collins, CO 80523 |
| Routine Sample Fee: | $35 routine garden soil analysis |
| Expected Turnaround: | 7 to 10 business days |
| Official Lab Website: | https://agsci.colostate.edu/soiltestinglab/ |
How to Collect and Submit a Soil Sample in Jefferson County:
- Pick up a Soil Kit: Pick up official sample boxes and submittal forms at the Colorado State University Extension - Jefferson County (Golden, Colorado 80401).
- 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 CSU Soil, Water and Plant Testing Laboratory.
3. Master Gardener Volunteer Program & Plant Clinic
The Jefferson County Extension Master Gardener Volunteers provides free plant disease diagnostics, lawn care advice, and eco-friendly pest management tips.
| Program Name: | Jefferson County Extension Master Gardener Volunteers |
| Plant Clinic Hours: | Tuesday & Thursday: 9:00 AM – 12:00 PM (Note: Plant clinics run seasonally; call office during winter months) |
| Direct Helpline Phone: | (080) 555-0199 |
| Program Portal: | https://agsci.colostate.edu/soiltestinglab/ |
Volunteer Training: Comprehensive horticulture training conducted by Colorado State University Extension.
4. Regional Soil & Growing Snapshot for Jefferson County
USDA Plant Hardiness Zone: Zone 5a / 6b
Natural Soil Profile: Alkaline Arid Clay Loam (pH 7.5 - 8.2 naturally)
Popular Local Crops: Peppers, tomatoes, melons, root vegetables, native perennials
Extension Specialist Tip: Colorado soils are naturally alkaline; add organic compost and elemental sulfur to manage soil pH.
5. 🧮 Interactive Soil Amendment Calculator for Jefferson County
Estimate the recommended agricultural limestone or elemental sulfur needed to adjust your garden soil pH based on local Alkaline Arid Clay Loam (pH 7.5 - 8.2 naturally) characteristics.
📚 Recommended Extension Guides & Soil Articles
Learn more about interpreting your Jefferson County extension soil test report and managing plant nutrients:
📦 Recommended Mail-In Soil Test Kits & Meters
FTC Affiliate Disclosure: We may earn a commissionIf you need immediate results without waiting for university mail-in lab turnaround times, these top-rated professional home soil test kits provide fast pH, N, P, and K diagnostic analysis:
MySoil Soil Test Kit
Professional mail-in kit analyzed by accredited labs. Returns 13 essential nutrient values (N, P, K, pH, Micronutrients) & customized fertilizer recommendations via app.
Luster Leaf Rapitest 1601
Popular color-comparator kit for 10 instant soil tests (pH, Nitrogen, Phosphorus, Potash). Includes tailored plant preference chart.
Sonkir 3-in-1 Soil Tester
Instant probe sensor for soil moisture, pH, and sunlight levels. Requires no batteries. Perfect for potted plants, lawns, and raised beds.
📋 Request Local Extension & Lawn Testing Assistance in Jefferson County, CO
Need help interpreting your lab results or finding local agricultural extension agents? Fill out the brief form below:
Frequently Asked Questions (Jefferson County Directory)
The Colorado State University Extension - Jefferson County is located at Golden, Colorado 80401. You can call their main desk directly at (080) 555-0199 during standard business hours (Monday – Friday: 8:00 AM – 4:30 PM).
Standard soil analysis for Jefferson County garden samples through CSU Soil, Water and Plant Testing Laboratory costs $35 routine garden soil analysis. Check with the office for special sample types.
You can reach the Jefferson County Extension Master Gardener Volunteers hotline by calling (080) 555-0199 during plant clinic hours (Tuesday & Thursday: 9:00 AM – 12:00 PM).
Jefferson County falls primarily within USDA Plant Hardiness Zone 5a / 6b. Local soil is characterized as Alkaline Arid Clay Loam (pH 7.5 - 8.2 naturally).
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.