Arizona’s extreme temperatures require beet planting in the cooler months of late fall or winter. Finding the best time to plant beets in Arizona can mean the difference between a sweet, tender harvest and tough, woody roots that bolt too quickly. This guide walks you through exactly when and how to plant beets in the Grand Canyon State’s unique climate zones.
Beets are a cool-season crop that thrive when temperatures stay between 50°F and 75°F. In Arizona, that window is narrow, especially in the low deserts. You need to plan around the heat to get a good crop.
This article covers planting times for Phoenix, Tucson, Flagstaff, and everywhere in between. You will learn soil prep, watering tricks, and variety choices that work best for Arizona gardeners.
Best Time To Plant Beets In Arizona
The absolute best time to plant beets in Arizona depends on where you live. The state has three main growing zones: low desert (below 3,000 feet), mid-elevation (3,000 to 5,000 feet), and high elevation (above 5,000 feet). Each zone has its own calendar.
For the low desert, including Phoenix and Tucson, plant beets from September through February. The ideal window is October through January. This avoids the scorching summer heat and the brief cold snaps that can damage young plants.
For mid-elevation areas like Prescott or Payson, plant beets from March through May for a spring crop, and again from August through October for a fall crop. These areas have milder summers and colder winters, so you get two planting windows.
For high elevation zones like Flagstaff, plant beets from April through June for summer harvest. You can also try a late July planting for a fall crop, but frost comes early so choose fast-maturing varieties.
Low Desert Planting Calendar
Phoenix, Tucson, Yuma, and other low desert areas have very hot summers and mild winters. Beets grow best here when planted in the cooler months.
- September: Start seeds in late September for a December harvest. Soil is still warm, so germination is fast.
- October: This is the prime month. Soil temps are ideal, and days are warm but not hot.
- November: Still good, but growth slows as days shorten. Mulch to keep soil warm.
- December: Possible but risky. Use cold frames or row covers if temps drop below 25°F.
- January: Late planting works if you choose quick-maturing varieties like ‘Early Wonder’.
- February: Last chance for a spring harvest. Beets may bolt if weather warms too fast.
Do not plant beets in the low desert from March through August. The heat causes poor germination, tough roots, and bitter flavor. Wait until September.
Mid-Elevation Planting Calendar
Areas like Prescott, Payson, Sedona, and Flagstaff’s lower edges have more moderate temperatures. You get two distinct planting seasons here.
- Spring planting: March through May. Start seeds as soon as soil can be worked. Beets tolerate light frost.
- Fall planting: August through October. Plant in late August for a November harvest. Use shade cloth if temps spike.
- Winter: Not recommended. Snow and hard freezes kill beet roots.
In mid-elevation zones, you can also try a late June planting for a summer harvest, but you must provide consistent water and partial shade. Beets grown in summer heat are smaller and less sweet.
High Elevation Planting Calendar
Flagstaff, Show Low, and other high elevation areas have short growing seasons. Beets need to mature before hard frosts arrive.
- Spring: April through June. Wait until soil reaches at least 45°F. Use black plastic to warm soil faster.
- Summer: July planting is possible for a fall harvest, but choose varieties that mature in 50 days or less.
- Fall: August planting is risky. Frost can hit by mid-September. Use row covers for protection.
High elevation gardeners should stick with spring planting for best results. Beets grow well in cool soil and can handle light frost, but hard freezes below 20°F will kill them.
Soil Preparation For Arizona Beets
Beets need loose, well-draining soil with a pH between 6.0 and 7.0. Arizona soil is often heavy clay or caliche, which can stunt root growth. You must prepare the bed properly.
Start by testing your soil pH. Most Arizona soil is alkaline, often above 7.5. Beets can tolerate slight alkalinity, but they grow best in neutral to slightly acidic soil. Add sulfur or peat moss to lower pH if needed.
Amend the soil with plenty of organic matter. Compost, aged manure, or leaf mold work well. Mix in 2 to 4 inches of compost into the top 8 inches of soil. This improves drainage and adds nutrients.
Remove rocks and debris from the planting area. Beets need uniform soil to form round, smooth roots. Rocks cause forked or misshapen beets.
Add a balanced fertilizer before planting. Use a 10-10-10 or similar formula at a rate of 1 pound per 100 square feet. Avoid high-nitrogen fertilizers, which cause lush tops but small roots.
Raised Beds For Better Drainage
Raised beds are ideal for beets in Arizona. They warm up faster in spring, drain better after monsoon rains, and allow you to control soil quality. Build beds at least 8 inches deep.
Fill raised beds with a mix of topsoil, compost, and sand. This creates the loose texture beets love. Water drains quickly, preventing root rot.
If you garden in clay soil, raised beds are almost essential. Without them, beets struggle to push through compacted earth. You will get smaller, tougher roots.
How To Plant Beet Seeds In Arizona
Beet seeds are actually clusters of seeds, each containing 2 to 5 embryos. This is why you often get multiple seedlings from one seed. You must thin them for proper root development.
Soak seeds in water for 12 to 24 hours before planting. This softens the seed coat and speeds germination. In Arizona’s dry climate, this step is especially helpful.
Sow seeds 1/2 inch deep and 1 to 2 inches apart in rows. Space rows 12 to 18 inches apart. Cover lightly with soil and water gently.
Germination takes 5 to 10 days in warm soil, longer in cool soil. Keep the soil consistently moist during this period. Arizona’s dry air can dry out the top inch of soil quickly, so check daily.
Once seedlings are 2 to 3 inches tall, thin them to 3 to 4 inches apart. Use scissors to cut the extras at soil level. Pulling them can disturb the roots of nearby plants.
Succession Planting For Continuous Harvest
To get a steady supply of beets, plant small batches every 2 to 3 weeks during your planting window. This is called succession planting. It works well in Arizona’s long growing season for cool crops.
For example, in the low desert, plant a row in early October, another in mid-October, and another in early November. You will have fresh beets from December through February.
In mid-elevation zones, plant every 2 weeks during spring and fall windows. This gives you a continuous harvest without a glut.
Watering Beets In Arizona
Consistent moisture is critical for beets. Inconsistent watering causes tough, woody roots and can lead to cracking. Arizona’s dry climate means you must water more often than in other regions.
Water deeply once or twice a week, depending on soil type and weather. Sandy soil needs more frequent watering, clay soil less. Aim for 1 to 1.5 inches of water per week, including rainfall.
Use drip irrigation or soaker hoses to deliver water directly to the roots. Overhead watering can cause leaf diseases and wastes water through evaporation. Drip systems are ideal for Arizona gardens.
Mulch around the plants with straw, wood chips, or compost. Mulch keeps soil cool, retains moisture, and suppresses weeds. In Arizona’s heat, mulch is a game-changer.
Check soil moisture regularly. Stick your finger 2 inches into the soil. If it feels dry, water. If it feels moist, wait a day or two. Beets are sensitive to both drought and waterlogging.
Signs Of Water Stress
- Wilting leaves: Too little water. Water immediately.
- Yellow leaves: Could be overwatering or nutrient deficiency. Check soil moisture.
- Cracked roots: Inconsistent watering. Keep soil evenly moist.
- Small roots: Usually from underwatering or overcrowding.
Fertilizing Beets For Best Growth
Beets are moderate feeders. They need a steady supply of nutrients, especially phosphorus and potassium for root development. Nitrogen is important for leaf growth but too much can hurt root quality.
Apply a balanced fertilizer at planting time. Side-dress with compost or a low-nitrogen fertilizer when plants are 4 to 6 inches tall. Use a 5-10-10 or similar formula.
Avoid high-nitrogen fertilizers like blood meal or fish emulsion. They produce huge leaves but small, hairy roots. Beets need more phosphorus and potassium than nitrogen.
If your soil is low in boron, beets may develop black spots or hollow centers. Add a small amount of borax (1 teaspoon per 100 square feet) to prevent this. Too much boron is toxic, so measure carefully.
Common Beet Varieties For Arizona
Not all beet varieties perform well in Arizona’s heat and soil. Choose varieties that are heat-tolerant, fast-maturing, and resistant to bolting. Here are the best options.
- ‘Detroit Dark Red’: Classic variety, reliable, good for all zones. Matures in 55-60 days.
- ‘Early Wonder’: Fast-maturing (50 days), good for spring planting. Tolerates heat better than most.
- ‘Golden Beet’: Sweet, mild flavor. Does not bleed like red beets. Good for fall planting.
- ‘Chioggia’: Italian heirloom with red and white rings. Matures in 55 days. Good for low desert.
- ‘Bull’s Blood’: Grown for both roots and leaves. Deep red leaves are edible. Matures in 55 days.
- ‘Cylindra’: Long, cylindrical roots. Good for heavy soil because they grow downward. Matures in 60 days.
For high elevation areas, choose varieties that mature in 50 days or less. ‘Early Wonder’ and ‘Pronto’ are good choices. For low desert, ‘Detroit Dark Red’ and ‘Chioggia’ work well.
Pest And Disease Management
Beets in Arizona face a few common pests and diseases. Most are manageable with good cultural practices. Avoid chemical pesticides when possible.
Leaf miners are the most common pest. They create winding tunnels in leaves. Remove affected leaves and use row covers to prevent flies from laying eggs. Neem oil can help.
Aphids can cluster on new growth. Spray them off with a strong stream of water. Insecticidal soap works if infestations are heavy.
Root maggots are less common in Arizona but can appear in cool, wet soil. Practice crop rotation and avoid planting beets where other root crops grew recently.
Diseases like powdery mildew and downy mildew can occur in humid conditions. Space plants for good air circulation and water at soil level. Remove infected leaves promptly.
Preventing Bolting
Bolting is when beets send up a flower stalk instead of forming a good root. This happens when plants are stressed by heat, cold, or inconsistent water. In Arizona, bolting is most common in spring plantings that experience a sudden heat wave.
To prevent bolting, plant at the right time for your zone. Keep soil consistently moist. Choose bolt-resistant varieties like ‘Early Wonder’ or ‘Red Ace’. Harvest beets before temperatures consistently exceed 80°F.
Harvesting And Storing Beets
Beets are ready to harvest when roots are 1 to 3 inches in diameter, depending on variety. Most take 50 to 70 days from planting. Check the seed packet for specific days to maturity.
Gently pull one or two beets to check size. If they are the size you want, harvest the rest. Do not let beets get too large, or they become woody and tough.
Cut the greens off about 1 inch above the root. Leave the root tip intact. Store beets in a plastic bag in the refrigerator for up to 2 weeks. Remove greens before storing, as they draw moisture from the root.
Beet greens are edible and nutritious. Wash and cook them like spinach or Swiss chard. They are high in vitamins A and C.
For long-term storage, cure beets by removing greens and storing them in a cool, dark place with high humidity. A root cellar or basement works well. They can last 3 to 4 months.
Frequently Asked Questions
Can I plant beets in Arizona summer?
No, summer heat is too intense for beets. They bolt, become woody, and taste bitter. Wait for cooler months.
How deep should I plant beet seeds in Arizona?
Plant seeds 1/2 inch deep. In sandy soil, you can go slightly deeper, up to 3/4 inch. In clay soil, keep it shallow.
Do beets need full sun in Arizona?
Beets need full sun in cooler months, but partial shade can help in late spring. In low desert, afternoon shade in March and April is beneficial.
What is the best fertilizer for beets in Arizona?
Use a low-nitrogen fertilizer like 5-10-10. Compost is also excellent. Avoid high-nitrogen formulas.
How often should I water beets in Arizona?
Water deeply once or twice a week, depending on weather. Check soil moisture regularly. Consistent moisture is key.
Final Tips For Success
Growing beets in Arizona is rewarding if you time it right. The best time to plant beets in Arizona is during the cooler months, from fall through early spring, depending on your elevation.
Start with good soil preparation. Use raised beds if you have heavy clay. Water consistently and mulch to retain moisture. Choose heat-tolerant varieties for best results.
Thin seedlings promptly to avoid overcrowding. Harvest beets when they are small to medium for the best flavor. Do not let them sit in the ground too long.
With these tips, you can enjoy fresh, homegrown beets from your Arizona garden. They are perfect for roasting, pickling, or eating raw in salads. Happy gardening.