When to Plant Beets in Pima County, AZ
Your May planting checklist for Pima County, Arizona
May rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Pima County, Arizona.
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Pick beets
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
Get ahead of June
- First harvests: beets
Beets are a dual-purpose root vegetable with edible roots and nutritious greens. They come in red, golden, and striped varieties and are rich in vitamins and minerals.
Pima County, Arizona is in USDA Zone 9b. The average last spring frost is April 1 and the first fall frost is November 9, giving you a growing season of approximately 222 days.
At an elevation of 4,327 feet, Pima County receives approximately 14.4 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 103°F, so Beets may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Beets will need more frequent watering and organic matter to retain nutrients. With low rainfall, drip irrigation is essential for growing Beets successfully. Mulch heavily to conserve soil moisture.
Pima County Soil Profile
Soil Type
Sandy Loam
Soil pH
6.8-8.3
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 Pima County
How your county's soil matches Beets's growing requirements.
Soil pH
Your soil pH (6.8–8.3) is more alkaline than Beets prefers (6.0–7.5). Add sulfur or peat moss to lower pH.
Soil Texture
Sandy soil in Pima County warms quickly in spring but drains fast. Beets will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Beets.
Organic Matter
Organic matter is low (0.9%). Add 2-3 inches of compost before planting Beets.
How to Plant Beets
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Beets
Sow every 5.7 weeks. Last sowing by Aug 31 to harvest before frost.
For a dedicated fall crop, sow by Sep 14.
Plant Water Budget
Water stress score is 10/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Beets
Beets needs approximately 0.8 inches of water per week (3.5" per month). Here's how your county's rainfall compares month by month.
| Month | Beets Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 0.9" | 0" | ❄️ Dormant |
| Feb | — | 0.8" | 0" | ❄️ Dormant |
| Mar | — | 0.7" | 0" | ❄️ Dormant |
| Apr | 3.5" | 0.5" | 3" | 🚿 Regular watering |
| May | 3.5" | 0.4" | 3.1" | 🚿 Regular watering |
| Jun | 3.5" | 0.5" | 3" | 🚿 Regular watering |
| Jul | 3.5" | 2.7" | 0.8" | 💧 Light watering |
| Aug | 3.5" | 3.2" | 0.3" | 💧 Light watering |
| Sep | 3.5" | 1.9" | 1.6" | 💧 Light watering |
| Oct | 3.5" | 1.4" | 2.1" | 🚿 Regular watering |
| Nov | 3.5" | 0.7" | 2.8" | 🚿 Regular watering |
| Dec | — | 0.9" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Nov in Pima County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Beets 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.
Beets Planting Timeline — Pima County, AZ
Beets Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | March 11 | Mar 11 – Apr 1 |
| Harvest | May 6 | May 6 – Jun 3 |
| Fall Sowing | September 14 | Sep 14 – Sep 28 |
Plant 0.5" deep · 4" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Direct Sow |
| April | Direct Sow |
| May | Harvest |
| June | Harvest |
| July | — |
| August | — |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.8"/week · 2-3 times/week
📅 Days to Maturity
50–70 days
🧪 Soil pH
Needs 6–7.5 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 9b
📆 Growing Season
222 days in Pima County
Growing Tips for Beets in Pima County
Direct sow Beets outdoors after April 01 in Pima County when soil has warmed and frost danger has passed.
Sandy soil in Pima County dries quickly — mulch Beets with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 103°F in Pima County, provide afternoon shade for Beets and water deeply in the morning.
General growing tips
Soak seeds overnight before planting to improve germination. Thin seedlings to 3-4 inches apart. Harvest roots when 1.5-3 inches in diameter for best texture.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Isolate 1/2 mile from Swiss chard — same species, they will cross.
Beets in Other Locations
Frequently Asked Questions
When should I plant Beets in Pima County, AZ?
Pima County is in Zone 9b with an average last frost of April 1. Plan your Beets planting based on this frost date — see the calendar above for exact timing.
What planting zone is Pima County, AZ?
Pima County, Arizona is in USDA Hardiness Zone 9b. The average last spring frost is April 1 and first fall frost is November 9.
Your Pima County Garden Planner — Free
A 24-page printable planner built for Pima 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.