When to plant Basil in Maricopa County, AZ
Maricopa County gardeners should plant Basil between February 7 and February 28 in spring. With Maricopa County's Zone 9b climate (last frost January 31), Basil needs 50–75 days to mature — plant by September 22 for a full harvest.
When to Plant Basil in Maricopa County, AZ
July in Maricopa County, Arizona — your action list
We've pulled the most time-sensitive tasks for Maricopa County, Arizona this July and put them front and centre. Tackle them in order.
Basil is a fragrant warm-season herb essential to Italian and Thai cuisines. It comes in many varieties including sweet, Thai, purple, and lemon types.
Maricopa County, Arizona is in USDA Zone 9b. The average last spring frost is January 31 and the first fall frost is December 6, giving you a growing season of approximately 309 days.
At an elevation of 4,014 feet, Maricopa County receives approximately 12.5 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 108°F, so Basil may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Basil will need more frequent watering and organic matter to retain nutrients. With low rainfall, drip irrigation is essential for growing Basil successfully. Mulch heavily to conserve soil moisture.
Maricopa County Soil Profile
Soil Type
Sandy Loam
Soil pH
7.2-8.5
Drainage
Well Drained
Basil 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 Maricopa County
How your county's soil matches Basil's growing requirements.
Soil pH
Your soil pH (7.2–8.5) is more alkaline than Basil prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
Sandy soil in Maricopa County warms quickly in spring but drains fast. Basil will need more frequent watering and regular compost additions to retain nutrients.
Organic Matter
Organic matter is low (0.7%). Add 2-3 inches of compost before planting Basil.
How to Plant Basil
Succession Planting Basil
Sow every 5.7 weeks. Last sowing by Sep 22 to harvest before frost.
Basil Water Budget
Water stress score is 10/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Basil
Basil 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 | Basil Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | 2.6" | 0.9" | 1.7" | 🚿 Regular watering |
| Feb | 2.6" | 0.8" | 1.8" | 🚿 Regular watering |
| Mar | 2.6" | 0.7" | 1.9" | 🚿 Regular watering |
| Apr | 2.6" | 0.5" | 2.1" | 🚿 Regular watering |
| May | 2.6" | 0.3" | 2.3" | 🚿 Regular watering |
| Jun | 2.6" | 0.4" | 2.2" | 🚿 Regular watering |
| Jul | 2.6" | 2.1" | 0.5" | 💧 Light watering |
| Aug | 2.6" | 2.3" | 0.3" | 💧 Light watering |
| Sep | 2.6" | 1.9" | 0.7" | 💧 Light watering |
| Oct | 2.6" | 1.2" | 1.4" | 🚿 Regular watering |
| Nov | 2.6" | 0.6" | 2" | 🚿 Regular watering |
| Dec | 2.6" | 0.8" | 1.8" | 🚿 Regular watering |
Water needs are for active growing months only (Jan–Dec in Maricopa County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Basil 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.
Basil Planting Timeline — Maricopa County, AZ
Basil Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 20 | Dec 20 – Jan 3 |
| Transplant Outdoors | February 7 | Feb 7 – Feb 21 |
| Direct Sow | February 7 | Feb 7 – Feb 28 |
| Harvest | April 4 | Apr 4 – Jun 6 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Transplant Outdoors Direct Sow |
| March | — |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | Start Indoors |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.6"/week · 1-2 times/week
📅 Days to Maturity
50–75 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 9b
📆 Growing Season
309 days in Maricopa County
Growing Tips for Basil in Maricopa County
Direct sow Basil outdoors after January 31 in Maricopa County when soil has warmed and frost danger has passed.
Sandy soil in Maricopa County dries quickly — mulch Basil with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 108°F in Maricopa County, provide afternoon shade for Basil and water deeply in the morning.
General growing tips
Start seeds indoors or direct sow after last frost. Pinch flower buds to extend leaf production. Harvest leaves from the top down, cutting just above a leaf pair.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Isolate 150 ft between varieties. Different basil species can cross.
Basil in Other Locations
Frequently Asked Questions
When should I plant Basil in Maricopa County, AZ?
Maricopa County is in Zone 9b with an average last frost of January 31. Plan your Basil planting based on this frost date — see the calendar above for exact timing.
What planting zone is Maricopa County, AZ?
Maricopa County, Arizona is in USDA Hardiness Zone 9b. The average last spring frost is January 31 and first fall frost is December 6.
When should I plant Basil in Maricopa County, AZ?
In Maricopa County, AZ, plant Basil after the last frost (around January 31) and before the first frost (around December 6). Best results when soil holds above 50°F.
What growing zone is Maricopa County, AZ for Basil?
Maricopa County sits in USDA Zone 9b. Basil grows reliably in zones 4a through 11b, so it's a good fit here.
Can Basil grow in Maricopa County's climate?
Yes — Basil grows well in Maricopa County's temperate climate. Maricopa County averages a 310-day frost-free season, with last frost around January 31 and first frost around December 6.
Your Maricopa County Garden Planner — Free
A 22-page printable planner built for Maricopa County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.