Red tomatoes

Best Planting Times for Tomatoes in Wyoming

Planting MethodActivityRecommended Dates
Outdoor PlantingIndoor Seed StartingApril 15 – May 15
Transplant OutdoorsJune 1 – June 15
Greenhouse PlantingYear-roundAdjust planting based on temperature control in the greenhouse

Planting Conditions

Wyoming has a semi-arid to arid climate with cold winters and short, warm summers. The state falls within USDA Hardiness Zones 3a to 5b, meaning the growing season is quite short and requires careful planning.

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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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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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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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Greenhouse Growing

In Wyoming, where the growing season can be shortened by cooler temperatures and unpredictable weather, a greenhouse is essential for extending the season. It allows you to start your tomato plants earlier in the spring and continue growing them well into the fall. With proper heating, you can protect your plants from frost and potentially grow tomatoes year-round.

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 is essential to provide your tomato plants with the nutrients they need for strong growth and a successful harvest.
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Other planting guides for Wyoming:

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

Plant tomatoes outdoors approximately 1-2 weeks after the last frost when the soil has warmed sufficiently to support growth.

Average Last Frost Dates for Wyoming’s Largest Cities

CityAverage Last Frost Date
CheyenneMay 15
CasperMay 22
LaramieMay 31
GilletteMay 25
Rock SpringsMay 27
SheridanMay 20
Green RiverMay 27
EvanstonMay 29
RivertonMay 25
CodyMay 21

Please note: These dates are averages and can vary from year to year. It is always a good idea to monitor local weather forecasts and consider your specific location and microclimate when planning your gardening activities.

Starting Tomatoes Indoors

In cities like Cheyenne (Zone 5a), start tomato seeds indoors from April 15 to May 15. This schedule ensures that seedlings are ready for outdoor transplanting in early to mid-June, after the risk of frost has passed.

Transplanting Tomato Seedlings

Transplant seedlings outdoors from June 1 to June 15, ensuring that soil temperatures are consistently above 60°F. Space the seedlings 24-36 inches apart in rows at least 36 inches apart to ensure good air circulation and sunlight exposure.

General Care and Maintenance

Watering:

  • Water deeply and consistently to keep the soil evenly moist. Wyoming’s dry climate can cause soil to dry out quickly, making regular watering essential.
  • Water at the base of the plants to prevent wetting the foliage, which helps reduce the risk of fungal diseases.

Fertilizing:

  • Apply a balanced fertilizer at planting and again when the first fruits begin to set. Adding compost to the soil before planting can improve fertility and soil structure.

Pest and Disease Management:

  • Monitor for common pests like aphids, cutworms, and tomato hornworms. Wyoming’s dry climate generally has lower pest pressure, but vigilance is still necessary.
  • Use organic or integrated pest management strategies to protect your plants from pests and diseases.

Harvesting Tomatoes:

  • Harvest tomatoes when they are fully colored and firm. Regular harvesting during Wyoming’s short summer months helps maintain fruit quality and prevents overripening.
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