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When to Plant Watermelon in Colorado

When to Plant Watermelon in Colorado

Watermelon is a refreshing and delicious fruit that thrives in warmer climates, making it a popular choice for gardeners in Colorado. However, due to the state’s unique climate and elevation, it’s important to know the best time to plant watermelon to ensure a successful harvest. In this article, we will discuss the ideal planting time for watermelon in Colorado, as well as provide answers to some frequently asked questions.

Ideal Planting Time for Watermelon in Colorado:

Watermelon plants require warm soil and plenty of sunshine to grow and produce juicy fruits. In Colorado, where the weather can be unpredictable, it’s crucial to wait until the danger of frost has passed before planting watermelon. The average last frost date in Colorado varies by region, but generally falls between late April and early June.

To determine the best time to plant watermelon in your specific area, it’s recommended to consult the Colorado State University Extension Office or local gardening resources. They can provide you with the average frost dates, as well as other specific information for your region.

In general, watermelon seeds can be directly sown outdoors when the soil temperature reaches a consistent 70-85 degrees Fahrenheit. This typically occurs in Colorado around mid to late May. However, it’s important to note that watermelon plants are also sensitive to cold nights, so it’s best to wait until nighttime temperatures consistently stay above 50 degrees Fahrenheit.


Q: Can I start watermelon seeds indoors and transplant them outside later?

A: While it is possible to start watermelon seeds indoors, they have sensitive root systems and do not transplant well. It is generally recommended to sow watermelon seeds directly into the ground where they will be growing.

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Q: How long does it take for watermelon seeds to germinate?

A: Watermelon seeds typically take about 7-10 days to germinate, but this can vary depending on the variety and growing conditions.

Q: How far apart should I space watermelon plants?

A: Watermelon plants require ample space to spread out and grow. It’s recommended to space them about 3-5 feet apart in rows, with 6-10 feet between rows. This spacing allows for proper air circulation and helps prevent diseases.

Q: How often should I water watermelon plants?

A: Watermelon plants require consistent moisture, especially during hot and dry periods. It’s important to water them deeply, providing about 1-2 inches of water per week. However, be cautious not to overwater, as this can lead to root rot or other issues.

Q: When should I harvest watermelon?

A: The time to harvest watermelon can vary depending on the variety and growing conditions. In general, watermelons are ready to harvest when the fruit’s skin turns dull and the underside (where the fruit touches the ground) changes from white to yellow. Additionally, the tendril closest to the fruit should be brown and dry.

In conclusion, the ideal time to plant watermelon in Colorado is after the danger of frost has passed and the soil temperature remains consistently warm. Mid to late May is typically a suitable time for planting, but it’s essential to consider your specific region’s frost dates and local climate conditions. By following these guidelines and consulting local gardening resources, you can enjoy a bountiful watermelon harvest in your Colorado garden.

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