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When to Plant Mustard Greens in Clay County, MS

Mustard greens are fast-growing brassicas with a spicy, peppery kick. They come in green, red, and purple varieties and are excellent cooked or in salads.

Clay County, Mississippi is in USDA Zone 7b. The average last spring frost is March 23 and the first fall frost is November 7, giving you a growing season of approximately 229 days.

At an elevation of 456 feet, Clay County receives approximately 61.8 inches of rainfall annually with predominantly clay loam soil. Summer highs average 88ยฐF, providing good warmth for Mustard Greens during the growing season. Clay soil retains moisture well for Mustard Greens, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Mustard Greens root diseases.

Clay County, MS (Zone 7b) Long season
229 days
Last Spring Frost March 23
229 growing days
First Fall Frost November 7

Clay County Soil Profile

Soil Type

Clay Loam

Soil pH

5.6-6.7

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (132 days to spare)
Start indoors: Feb 8 Transplant: Mar 15 🍅 Harvest: Apr 19 – Jun 21
Recommended (50%) ✓ Fits season (131 days to spare)
Start indoors: Feb 16 Transplant: Mar 23 🍅 Harvest: Apr 27 – Jun 29
Safe Start (90%) ✓ Fits season (130 days to spare)
Start indoors: Mar 8 Transplant: Apr 12 🍅 Harvest: May 17 – Jul 19

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

Plant needs
1.0″/week
Rainfall provides
1.1″/week
Watering frequency Natural rainfall sufficient
Season total 0 gal / 100 sq ft
Mustard Greens needs ~640 GDD — county provides 3,664 GDD Excellent fit

Mustard Greens Planting Timeline โ€” Clay County, MS

Mustard Greens Planting Calendar

Activity When Date Range
Start Indoors February 16 Feb 16 โ€“ Mar 2
Transplant Outdoors March 23 Mar 23 โ€“ Apr 6
Direct Sow March 9 Mar 9 โ€“ Mar 30
Fall Sowing August 29 Aug 29 โ€“ Sep 12
Harvest April 27 Apr 27 โ€“ Jun 29

Plant 0.5" deep ยท 6" apart ยท Rows 12" apart

Month-by-Month Timeline

MonthActivities
January โ€”
February Start Indoors
March Start Indoors Transplant Outdoors Direct Sow
April Transplant Outdoors Harvest
May Harvest
June Harvest
July โ€”
August Fall Sowing
September Fall Sowing
October โ€”
November โ€”
December โ€”

Growing Conditions

Sun

Partial Shade (3-6 hours)

Water

Moderate โ€” regular watering

Days to Maturity

30โ€“50 days

Soil pH

6 โ€“ 7

USDA Zone

Zone 7b

Growing Season

229 days

Growing Tips for Clay County

Direct sow in early spring or fall. Harvest young leaves for milder flavor. Plants bolt quickly in heat so grow as a cool-season crop or provide shade.

Companion Planting

Good Companions

Avoid Planting Near

  • Strawberries

Level Up Your Garden

Frequently Asked Questions

When should I plant Mustard Greens in Clay County, MS?

Clay County is in Zone 7b with an average last frost of March 23. Plan your Mustard Greens planting based on this frost date โ€” see the calendar above for exact timing.

What planting zone is Clay County, MS?

Clay County, Mississippi is in USDA Hardiness Zone 7b. The average last spring frost is March 23 and first fall frost is November 7.

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Plan Your Garden with Confidence

Get our free Garden Planner โ€” designed to help Clay County gardeners in Zone 7b organize planting dates, track what's growing, and never miss a planting window.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Clay County, MS. Local conditions may vary. Last updated: April 2026.