As the days grow warmer and longer, gardening season is just around the corner in Denver. But if you're itching to dig in the dirt, here's one tip seasoned local gardeners swear by: wait until after Mother’s Day to plant your garden. In the Mile High City, late spring freezes are still possible through early May, and Mother’s Day (May 11 this year) is the unofficial green light that it’s finally safe to plant your summer garden.
Whether you're a first-time gardener or a seasoned pro, these local gardening tips will help your plants thrive in Colorado’s unique climate:
1. Timing Is Everything
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Don’t plant too early. Denver’s unpredictable spring weather—including snow in May—is tough on young plants.
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Mother’s Day rule of thumb: After this date, the risk of a hard frost drops significantly.
2. Know Your Zone
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Denver sits in USDA Hardiness Zones 5b to 6a, which means it’s best to choose plants that can handle some temperature swings.
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Look for drought-tolerant and cold-hardy varieties, especially for early planting.
3. Start with the Right Plants
Here are a few local favorites that tend to thrive in Denver’s high-altitude conditions:
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Vegetables: Tomatoes, peppers, kale, carrots, lettuce, and zucchini
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Herbs: Basil, rosemary, thyme, mint, and chives
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Flowers: Marigolds, petunias, geraniums, and lavender
4. Prep Your Soil
Denver’s soil can be clay-heavy and alkaline, so it benefits from:
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Compost or organic matter to improve texture and nutrients
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A soil test to understand pH and adjust with amendments as needed
5. Be Smart About Watering
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Water early in the morning to prevent evaporation
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Use drip irrigation or soaker hoses to conserve water and nourish roots
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Mulch your beds to retain moisture and protect against heat
6. Protect Against Hail & Wind
Late spring hailstorms can destroy young plants.
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Invest in row covers or plant tunnels for protection
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Use stakes or cages to support taller plants against strong winds
7. Encourage Pollinators
Help your garden thrive (and support the ecosystem!) by:
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Planting native flowers like bee balm or coneflower
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Skipping pesticides that harm bees and butterflies
8. Start Small & Build Over Time
You don’t have to plant a full vegetable garden overnight. Start with a few containers or raised beds and expand as you learn what works best in your space.
Ready to Grow?
Gardening in Denver can be incredibly rewarding—with a little patience and a lot of sunshine. Remember, waiting until after Mother’s Day gives your plants the best chance to grow strong and healthy all season long.
Happy planting! 🌿
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