When to Plant Delicata Squash in Sullivan County, TN
May to-do list for Sullivan County, Tennessee
May rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Sullivan County, Tennessee.
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Move delicata squash from tray to bed
Water the tray well an hour before you transplant. Roots slide out cleanly and settle in faster.
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Indoor seed-starting week for delicata squash
Starting these indoors now means sturdy transplants ready the moment your soil warms up.
Delicata squash is a winter squash with an edible skin and sweet, creamy orange flesh. Its compact vines make it suitable for smaller gardens.
Sullivan County, Tennessee is in USDA Zone 7b. The average last spring frost is April 23 and the first fall frost is October 19, giving you a growing season of approximately 179 days.
At an elevation of 3,986 feet, Sullivan County receives approximately 46.6 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86°F, providing good warmth for Delicata Squash during the growing season.
Sullivan County Soil Profile
Soil Type
Silt Loam
Soil pH
5.4-7.1
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 Sullivan County
How your county's soil matches Delicata Squash's growing requirements.
Soil pH
Your soil pH (5.4–7.1) overlaps with Delicata Squash's range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Sullivan County is excellent for Delicata Squash — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.5%). Annual compost additions will help Delicata Squash.
How to Plant Delicata Squash
Succession Planting Delicata Squash
Sow every 9.1 weeks. Last sowing by Jul 11 to harvest before frost.
Plant Water Budget
Monthly Watering Guide for Delicata Squash
Delicata Squash needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Delicata Squash Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 3.9" | 0" | ❄️ Dormant |
| Feb | — | 3.3" | 0" | ❄️ Dormant |
| Mar | — | 4.7" | 0" | ❄️ Dormant |
| Apr | 4.3" | 3.3" | 1" | 💧 Light watering |
| May | 4.3" | 3.6" | 0.7" | 💧 Light watering |
| Jun | 4.3" | 4.1" | 0.2" | 💧 Light watering |
| Jul | 4.3" | 4.8" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 4.9" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 3.3" | 1" | 💧 Light watering |
| Oct | 4.3" | 3.2" | 1.1" | 💧 Light watering |
| Nov | — | 3.8" | 0" | ❄️ Dormant |
| Dec | — | 3.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Sullivan County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Delicata Squash 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.
Delicata Squash Planting Timeline — Sullivan County, TN
Delicata Squash Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 26 | Mar 26 – Apr 9 |
| Transplant Outdoors | May 7 | May 7 – May 21 |
| Direct Sow | April 30 | Apr 30 – May 21 |
| Harvest | July 30 | Jul 30 – Sep 3 |
Plant 1" deep · 30" apart · Rows 42" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
80–100 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 7b
📆 Growing Season
179 days in Sullivan County
Growing Tips for Delicata Squash in Sullivan County
Direct sow Delicata Squash outdoors after April 23 in Sullivan County when soil has warmed and frost danger has passed.
Common pests for Delicata Squash in this region include squash vine borer and cucumber beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow after last frost on mounds. Harvest when skin is hard and ivory with green stripes. The thin skin does not need peeling. Stores 2-3 months in a cool place.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Delicata Squash in Other Locations
Frequently Asked Questions
When should I plant Delicata Squash in Sullivan County, TN?
Sullivan County is in Zone 7b with an average last frost of April 23. Plan your Delicata Squash planting based on this frost date — see the calendar above for exact timing.
What planting zone is Sullivan County, TN?
Sullivan County, Tennessee is in USDA Hardiness Zone 7b. The average last spring frost is April 23 and first fall frost is October 19.
Your Sullivan County Garden Planner — Free
A 24-page printable planner built for Sullivan County (Zone 7b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.