When to Plant Bok Choy in Kauai County, HI
Bok choy is a Chinese cabbage variety with crisp white stalks and dark green leaves. It is a fast-growing cool-season crop ideal for stir-fries and soups.
Kauai 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 577 feet, Kauai County receives approximately 89.5 inches of rainfall annually with predominantly silty clay soil. Summer highs average 90°F, providing good warmth for Bok Choy during the growing season. Clay soil retains moisture well for Bok Choy, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Bok Choy root diseases.
Kauai County Soil Profile
Soil Type
Silty Clay
Soil pH
5.5-6.7
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 Kauai County
How your county's soil matches Bok Choy's growing requirements.
Soil pH
Your soil pH (5.5–6.7) overlaps with Bok Choy's range (6.0–7.5), though not a perfect match.
Soil Texture
Your silty clay soil in Kauai County is workable for Bok Choy. Add compost annually to improve structure.
Organic Matter
Organic matter is excellent (4.5%) — Bok Choy will thrive.
How to Plant Bok Choy
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Plant Water Budget
Monthly Watering Guide for Bok Choy
Bok Choy needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Bok Choy Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | 3" | 12.1" | 0" | ✅ Rainfall sufficient |
| Feb | 3" | 8.6" | 0" | ✅ Rainfall sufficient |
| Mar | 3" | 10.5" | 0" | ✅ Rainfall sufficient |
| Apr | 3" | 8.4" | 0" | ✅ Rainfall sufficient |
| May | 3" | 5.3" | 0" | ✅ Rainfall sufficient |
| Jun | 3" | 2.5" | 0.5" | 💧 Light watering |
| Jul | 3" | 2.2" | 0.8" | 💧 Light watering |
| Aug | 3" | 3.1" | 0" | ✅ Rainfall sufficient |
| Sep | 3" | 4.3" | 0" | ✅ Rainfall sufficient |
| Oct | 3" | 9.8" | 0" | ✅ Rainfall sufficient |
| Nov | 3" | 9.3" | 0" | ✅ Rainfall sufficient |
| Dec | 3" | 13.3" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Jan–Dec in Kauai County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Bok Choy 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.
Bok Choy Planting Timeline — Kauai County, HI
Bok Choy Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 4 | Dec 4 – Dec 18 |
| Transplant Outdoors | January 1 | Jan 1 – Jan 15 |
| Direct Sow | December 11 | Dec 11 – Jan 1 |
| Harvest | February 12 | Feb 12 – Mar 19 |
| Fall Sowing | November 5 | Nov 5 – Nov 19 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors Direct Sow |
| February | Harvest |
| March | Harvest |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | Fall Sowing |
| December | Start Indoors Direct Sow |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.7"/week · Natural rainfall sufficient
📅 Days to Maturity
40–60 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 11a
📆 Growing Season
364 days in Kauai County
Growing Tips for Bok Choy in Kauai County
With Kauai County's clay soil (31% clay), work in 3-4 inches of compost before planting Bok Choy. Avoid tilling when soil is wet to prevent compaction.
Your generous 365.0-day season in Kauai County allows multiple plantings of Bok Choy. Sow every 20.0 days for continuous harvest.
Common pests for Bok Choy in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in spring or fall for best results. Keep soil consistently moist. Harvest whole heads or cut outer leaves for a cut-and-come-again approach.
Companion Planting
Good Companions
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Bok Choy in Other Locations
Frequently Asked Questions
When should I plant Bok Choy in Kauai County, HI?
Kauai County is in Zone 11a with an average last frost of January 1. Plan your Bok Choy planting based on this frost date — see the calendar above for exact timing.
What planting zone is Kauai County, HI?
Kauai 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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