When to Plant Dill in Maui County, HI
Dill is a feathery annual herb with aromatic leaves and seeds. Its fine foliage and umbrella-shaped flower heads attract beneficial insects to the garden.
Maui County, Hawaii is in USDA Zone 11a. The average last spring frost is January 1 and the first fall frost is December 31, giving you a growing season of approximately 364 days.
At an elevation of 24 feet, Maui County receives approximately 75.9 inches of rainfall annually with predominantly silty clay soil. Summer highs average 91°F, providing good warmth for Dill during the growing season. Clay soil retains moisture well for Dill, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Dill root diseases.
Maui County Soil Profile
Soil Type
Silty Clay
Soil pH
5.4-6.5
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 Maui County
How your county's soil matches Dill's growing requirements.
Soil pH
Your soil pH (5.4–6.5) overlaps with Dill's range (5.5–7.0), though not a perfect match.
Soil Texture
Your silty clay soil in Maui County is workable for Dill. Add compost annually to improve structure.
Organic Matter
Organic matter is moderate (3.8%). Annual compost additions will help Dill.
How to Plant Dill
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Plant Water Budget
Monthly Watering Guide for Dill
Dill needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Dill Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | 2.2" | 9.7" | 0" | ✅ Rainfall sufficient |
| Feb | 2.2" | 8.8" | 0" | ✅ Rainfall sufficient |
| Mar | 2.2" | 11.3" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 6.9" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 1.8" | 0.4" | 💧 Light watering |
| Aug | 2.2" | 2.6" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 3.3" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 6.7" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 9" | 0" | ✅ Rainfall sufficient |
| Dec | 2.2" | 9.6" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Jan–Dec in Maui County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Dill 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.
Dill Planting Timeline — Maui County, HI
Dill Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 4 | Dec 4 – Dec 18 |
| Transplant Outdoors | December 25 | Dec 25 – Jan 8 |
| Direct Sow | December 11 | Dec 11 – Jan 1 |
| Harvest | February 5 | Feb 5 – Apr 9 |
| Fall Sowing | November 5 | Nov 5 – Nov 19 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors Direct Sow |
| February | Harvest |
| March | Harvest |
| April | Harvest |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | Fall Sowing |
| December | Start Indoors Transplant Outdoors Direct Sow |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
40–60 days
🧪 Soil pH
Needs 5.5–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 11a
📆 Growing Season
364 days in Maui County
Growing Tips for Dill in Maui County
With Maui County's clay soil (38% clay), work in 3-4 inches of compost before planting Dill. Avoid tilling when soil is wet to prevent compaction.
Your generous 365.0-day season in Maui County allows multiple plantings of Dill. Sow every 20.0 days for continuous harvest.
Common pests for Dill in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
With 76" of annual rainfall in Maui County, ensure good drainage for Dill — excess moisture can promote root rot and fungal diseases.
General growing tips
Direct sow in spring as dill has a taproot and dislikes transplanting. Succession sow for continuous leaf harvest. Allow some plants to flower for seeds and to attract beneficial insects.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Dill in Other Locations
Frequently Asked Questions
When should I plant Dill in Maui County, HI?
Maui County is in Zone 11a with an average last frost of January 1. Plan your Dill planting based on this frost date — see the calendar above for exact timing.
What planting zone is Maui County, HI?
Maui County, Hawaii is in USDA Hardiness Zone 11a. The average last spring frost is January 1 and first fall frost is December 31.
Plan Your Garden with Confidence
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