Red tomatoes

Best Planting Times for Tomatoes in Arizona

Planting MethodActivityRecommended Dates
Outdoor PlantingIndoor Seed StartingFebruary 1 – March 1
Transplant OutdoorsMarch 15 – April 15
Greenhouse PlantingYear-roundAdjust planting to temperature control in greenhouse

Planting Conditions in Arizona

Arizona features a mostly arid climate, with hot summers and mild winters. This environment can be challenging but also rewarding for growing tomatoes, particularly if timing and techniques are adjusted to local conditions.

Sun Requirements

Tomatoes in Arizona need full sun, with at least 6-8 hours of direct sunlight daily. In hotter regions, some afternoon shade can help protect plants from extreme heat.

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Useful Tools for Starting Tomatoes Indoors

Using the right tools can save you time and increase your success rate.

Seeds

Quality seeds lead to better germination and healthier plants. Starting with high-quality seeds gives your tomatoes the best chance to thrive from the very beginning.
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Browse Tomato Seeds on Amazon

Planting Trays

Planting trays help you organize your seedlings and ensure they have enough space to grow before you transplant them outdoors. This makes the process more efficient and increases the chances of strong, healthy plants.
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Find Planting Trays on Amazon

Grow Lights

Grow lights are essential if you don’t have enough natural sunlight. They provide your seedlings with the light they need to grow strong and healthy, even in less-than-ideal conditions.
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Check out Grow Lights on Amazon

Seed Starting Soil

Using light, fine soil specifically designed for seed starting helps young roots establish quickly and promotes healthy growth. It’s an easy way to give your seedlings the best start possible.
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Get Seed Starting Soil on Amazon

Greenhouse Growing

Greenhouses provide an optimal environment for growing tomatoes by maintaining consistent temperatures, protecting from harsh weather, and extending the growing season. They allow you to control the growing conditions, resulting in healthier plants and higher yields.

Currently, the 8x10x7.5 FT Greenhouse is priced at $999. It’s a great investment for ensuring your tomatoes thrive all year round.
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Check the latest price on Amazon.

Fertilizer

Fertilizer plays an essential role in providing tomato plants with the nutrients they need for robust growth and a plentiful harvest.
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Explore Fertilizer on Amazon

Other planting guides for Arizona:

Any questions on growing tomatoes? Visit our forum to discuss: Growing Tomatoes

Starting Tomatoes Indoors

In Phoenix, AZ (Zone 9b), start seeds indoors from February 1 to March 1. This early start is crucial to avoid the extreme heat of summer, which can inhibit fruit setting.

Direct Sowing

Direct sowing is generally not recommended in Arizona due to the extreme heat during typical sowing periods. However, if attempted in cooler regions or during unseasonably cool springs, sow as early as the soil is workable and can be warmed above 60°F.

Transplanting Tomato Seedlings

Transplant seedlings outdoors from March 15 to April 15, once the danger of frost has passed and soil temperatures consistently exceed 60°F. Space seedlings 24-36 inches apart in rows that are at least 36 inches apart, to allow for good air circulation and growth.

General Care and Maintenance

Watering:

  • Water deeply and regularly, allowing for periods of soil drying to encourage strong root growth.
  • Adjust watering frequency based on temperature and rainfall, with increased attention during the hottest months.

Fertilizing:

  • Apply a balanced fertilizer at planting and every four to six weeks during the growing season, reducing frequency as fruit begins to mature.

Pest and Disease Management:

  • Monitor for common pests such as tomato hornworms and whiteflies.
  • Implement integrated pest management practices and use organic remedies when possible.

Harvesting Tomatoes:

  • Harvest tomatoes when they are firm and fully colored.
  • In intense heat, fruits may need to be harvested slightly earlier and allowed to ripen off the vine to avoid sunscald.

BeeJay
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