When to Plant in Longmont, CO

In Longmont, gardeners can expect a median last spring frost date of May 5 and a first fall frost on September 28, resulting in approximately 146 frost-free days each year. This time frame is crucial for planning your planting schedule and selecting the right crops to ensure a successful growing season.

The microclimate in Longmont is characterized as continental mountain, which means gardeners often experience cold nights and intense daytime sun. This environment is ideal for crops like tomatoes, peppers, and squash, which thrive in warmer temperatures and appreciate the long growing season. However, crops such as lettuce and peas may struggle due to the extreme temperature fluctuations and intense heat during the day, which can cause bolting or wilting.

FAQ

When is the last frost in Longmont?

The last frost in Longmont typically occurs on May 5. This date is critical for gardeners to plan their planting schedules.

What vegetables grow best in Longmont?

Vegetables that thrive in Longmont include tomatoes, peppers, and squash, thanks to the region's sunny days and long growing season.

When should I plant tomatoes in Longmont?

Tomatoes should be transplanted outdoors after the last frost date of May 5 for optimal growth and yield.

Can I garden year-round in Longmont?

While Longmont has cold winters, you can garden year-round by utilizing greenhouses or cold frames to extend the season.

How does Plan My Garden help Longmont gardeners?

Plan My Garden offers tailored advice, planting calendars, and tips specifically designed for the climate challenges and advantages present in Longmont.

Frost dates for Longmont ZIP codes

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