When to Plant Parsley in Collin County, TX
May to-do list for Collin County, Texas
Each item below is timed to Collin County, Texas's frost dates and soil temperatures. Skip nothing, stress about nothing.
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It's harvest week for parsley
Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.
Before June arrives, get these ready
- First harvests: parsley
Parsley is a biennial herb available in flat-leaf (Italian) and curly varieties. It is a nutritional powerhouse rich in vitamins C and K and adds fresh flavor to countless dishes.
Collin County, Texas is in USDA Zone 8b. The average last spring frost is March 10 and the first fall frost is November 20, giving you a growing season of approximately 255 days.
At an elevation of 103 feet, Collin County receives approximately 65.2 inches of rainfall annually with predominantly clay soil. Summer highs average 94°F, providing good warmth for Parsley during the growing season. Clay soil retains moisture well for Parsley, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Parsley root diseases.
Collin County Soil Profile
Soil Type
Clay
Soil pH
7.3-7.8
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.
Soil Compatibility in Collin County
How your county's soil matches Parsley's growing requirements.
Soil pH
Your soil pH (7.3–7.8) is more alkaline than Parsley prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
Heavy clay soil (43% clay) in Collin County compacts easily and drains slowly. Amend with compost and avoid working soil when wet.
Organic Matter
Organic matter is moderate (2.7%). Annual compost additions will help Parsley.
How to Plant Parsley
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Parsley
Sow every 6.9 weeks. Last sowing by Sep 01 to harvest before frost.
For a dedicated fall crop, sow by Sep 11.
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Parsley
Parsley needs approximately 0.6 inches of water per week (2.6" per month). Here's how your county's rainfall compares month by month.
| Month | Parsley Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.8" | 0" | ❄️ Dormant |
| Feb | — | 2.2" | 0" | ❄️ Dormant |
| Mar | 2.6" | 4.3" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 6.9" | 0" | ✅ Rainfall sufficient |
| May | 2.6" | 10.2" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 9.9" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 7.3" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 8.4" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 6.5" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 3.9" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 2.2" | 0.4" | 💧 Light watering |
| Dec | — | 1.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Collin County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Parsley Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Parsley Planting Timeline — Collin County, TX
Parsley Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 3 | Feb 3 – Feb 17 |
| Transplant Outdoors | March 3 | Mar 3 – Mar 17 |
| Direct Sow | February 24 | Feb 24 – Mar 17 |
| Harvest | May 5 | May 5 – Jul 7 |
| Fall Sowing | September 11 | Sep 11 – Sep 25 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.6"/week · Natural rainfall sufficient
📅 Days to Maturity
60–80 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 8b
📆 Growing Season
255 days in Collin County
Growing Tips for Parsley in Collin County
Direct sow Parsley outdoors after March 10 in Collin County when soil has warmed and frost danger has passed.
With Collin County's clay soil (43% clay), work in 3-4 inches of compost before planting Parsley. Avoid tilling when soil is wet to prevent compaction.
Common pests for Parsley in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6-8 weeks before last frost. Soak seeds overnight as germination is slow. Harvest outer stems first to keep plants productive. Parsley attracts swallowtail butterflies.
Companion Planting
Good Companions
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Check more plant combinations with our Companion Planting Checker →
Parsley in Other Locations
Frequently Asked Questions
When should I plant Parsley in Collin County, TX?
Collin County is in Zone 8b with an average last frost of March 10. Plan your Parsley planting based on this frost date — see the calendar above for exact timing.
What planting zone is Collin County, TX?
Collin County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is March 10 and first fall frost is November 20.
Your Collin County Garden Planner — Free
A 24-page printable planner built for Collin County (Zone 8b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.