Spring in Colorado is a unique time for gardening due to the varying climates and altitudes across the state. The weather can be unpredictable, so gardeners must be prepared for late frosts and dry spells. Here are some tips to help you get started with spring planting in Colorado.
When to Start Planting
Spring in Colorado can be a rollercoaster of warm days and unexpected snowstorms, so timing is key.
- Cool-Season Crops (lettuce, spinach, peas): These can be planted as early as late March to early April. They can tolerate light frosts and cooler temperatures.
- Warm-Season Crops (tomatoes, peppers, beans): Wait until the danger of frost has passed, typically after Mother’s Day (May 10-15). You can also start seeds indoors 6-8 weeks before the last frost date.
Choosing the Right Plants
Choose plants that are well-suited for Colorado’s climate and be mindful of both elevation and microclimates in your area. Before you get started, know your Hardiness Zone before and understand that high altitude areas will need to take special precautions when planting.
- Cool-Season Vegetables (early spring planting):
- Lettuce
- Spinach
- Kale
- Peas
- Carrots
- Broccoli
- Cabbage
- Warm-Season Vegetables (after the last frost date):
- Tomatoes (start indoors)
- Peppers (start indoors)
- Beans
- Cucumbers
- Squash
- Melons
- Flowers:
- Pansies (great for early spring)
- Petunias
- Marigolds
- Snapdragons
- Geraniums
- Sunflowers (plant after frost)
Starting Seeds Indoors
Starting seeds indoors allows you to get a jump start on the growing season. Start your seeds indoors 6-8 weeks before the last expected frost date. Use seed trays, pots, or even repurposed items like egg cartons for seed starting. Place seedlings in a sunny window or under grow lights to promote strong growth.
Before transplanting your seedlings outdoors, gradually expose them to outdoor conditions over the course of 7-10 days. Start by placing them outside for a few hours each day.
Watering
Spring can be dry, and Colorado’s altitude often leads to quick evaporation. Water deeply and regularly, especially for new plants. Add mulch to retain moisture and keep roots cool. Organic mulches like wood chips, straw, or grass clippings work well. Consider a drip irrigation system to conserve water and deliver it directly to the roots.
Protecting Plants from Frost
Even in spring, Colorado can experience frost after planting. To protect young plants from a late frost use row covers, cloches, or frost blankets to cover plants during cold nights. Water your plants in the morning before a frost is expected, as moist soil retains heat better than dry soil. If a frost is expected, bring plants in containers inside or keep them in the garage.
Gardening Tips for Colorado’s Climate
- Wind Protection: Colorado can be windy, especially in the spring. Use windbreaks (such as fences, shrubs, or screens) to protect young plants.
- Microclimates: Take advantage of microclimates around your garden, such as south-facing walls that provide more warmth for frost-sensitive plants.
- Vertical Gardening: In areas with limited space or poor soil, consider vertical gardening using trellises or towers for crops like peas, beans, or cucumbers.
Spring planting in Colorado requires careful planning, timing, and a bit of patience, but with the right preparation, your garden can thrive. Start with the right plants for your zone, keep an eye on frost dates, and use water-wise gardening techniques.