Early Girl Tomato in Zone 5B — Mountain West

Early Girl Tomato is a winner in our Mountain gardens because it delivers that classic tomato flavor faster than almost any other variety. You get juicy, slightly acidic tomatoes perfect for slicing, sauces, and salads, and it's incredibly satisfying to harvest ripe tomatoes from your own garden so early in our short growing season.

Our high altitude, intense sun, and cool nights mean we have to be smart about choosing varieties that can handle our 149-day growing season. While Early Girl is considered a "tender" plant, careful timing and a little protection will get you a great harvest.

Starting your Early Girl Tomato seeds indoors is the way to go in our Zone 5B Mountain climate. Aim to start your seeds late March through late April, giving them about 6 weeks to get a head start before transplanting. Remember, our spring weather can be unpredictable, so it's best to be prepared.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, but not soggy. Bottom watering is a great technique — set the tray in a shallow dish of water and let the soil soak it up from the bottom. Provide warmth (around 70-75°F) and plenty of light, either from a sunny window or a grow light.

Transplant your Early Girl Tomato seedlings outdoors mid May through late June, after the danger of frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the intense sun and cooler temperatures of our Mountain environment.

Plant your seedlings 24-36 inches apart in a sunny spot with well-drained soil. Be prepared for late-season temperature swings and possible hail. Have row covers ready to protect young plants.

Early Girl Tomatoes need consistent moisture, especially in our dry Mountain climate. While they're more forgiving than some varieties, you still need to be vigilant. During the peak of summer, when temperatures are around 85°F, you'll likely need to water deeply 2-3 times a week, providing about 1-2 inches of water each time.

Use the "finger test" to check the soil moisture — stick your finger about 2 inches deep into the soil near the base of the plant. If it feels dry, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our low-humidity environment.

Signs of underwatering include wilting leaves and dry soil, while overwatering can lead to yellowing leaves and root rot. A good layer of mulch around the base of your plants will help retain moisture and keep the soil temperature consistent.

Early Girl Tomatoes are an indeterminate variety, meaning they'll keep growing and producing fruit throughout the season. This means they need support to keep them off the ground and prevent the stems from breaking under the weight of the tomatoes.

Standard 5-foot tomato cages or sturdy stakes work well. Install the support at planting time to avoid disturbing the roots later on. As the plant grows, gently guide the stems through the cage or tie them to the stake with soft twine.

Pruning your Early Girl Tomato plants can help encourage earlier ripening, which is especially important in our short growing season. Focus on removing the suckers that grow in the "armpit" between the main stem and the branches.

Removing these suckers directs the plant's energy towards fruit production rather than foliage growth. Also, remove any yellowing or dead leaves near the bottom of the plant to improve air circulation. As the first frost approaches in early October, you can top the plant to encourage the remaining green tomatoes to ripen.

You can expect your first harvest of Early Girl Tomatoes early July through early September, about 50 days after transplanting. The tomatoes are ready to pick when they turn a deep red color and are slightly soft to the touch.

Gently twist the tomato off the vine, being careful not to damage the plant. Regular harvesting encourages continued production. As the end of the season approaches and frost threatens, harvest any remaining green tomatoes and bring them indoors to ripen. They'll ripen best in a single layer, out of direct sunlight.

Here are some common problems you might encounter with Early Girl Tomatoes in our Mountain gardens:

Blossom End Rot

• What it looks like: A sunken, dark brown or black leathery patch on the bottom of the tomato.
• What causes it: Inconsistent watering leading to calcium deficiency. Our dry climate and occasional heavy rains can create these fluctuations.
• How to fix/prevent it: Water consistently, especially during fruit development. Mulch heavily to maintain even soil moisture. Remove affected fruit.

Early Blight

• What it looks like: Brown spots with concentric rings on lower leaves, spreading upward. Leaves yellow and drop.
• What causes it: A fungal disease that thrives in warm, humid conditions, although our low humidity can still allow it to spread through soil splash.
• How to fix/prevent it: Remove and destroy affected leaves. Mulch to prevent soil splash. Water at the base of the plant. Copper fungicide can slow the spread.

Hornworms

• What it looks like: Large sections of leaves stripped overnight. Large green caterpillars with white stripes.
• What causes it: Voracious caterpillars that can defoliate plants quickly.
• How to fix/prevent it: Handpick them (look closely, they blend in!). Bt spray is effective and organic.

Cracking

• What it looks like: Splits in the tomato skin, either concentric or radial.
• What causes it: Heavy watering after a dry spell. Our erratic rainfall can make this worse.
• How to fix/prevent it: Water consistently. Mulch to maintain even moisture. Harvest promptly when ripe.

Mountain West Specific Challenges: Our intense sun can exacerbate blossom end rot and cracking, so consistent watering and shade cloth during the hottest parts of the day can help. The dry air might seem to prevent fungal diseases, but even brief periods of humidity or overhead watering can lead to problems like early blight.

Companion planting can help your Early Girl Tomatoes thrive in our Mountain gardens. Basil is a great companion because it repels pests like tomato hornworms and whiteflies. Carrots improve the soil around tomato plants and deter nematodes. Parsley attracts beneficial insects and improves the flavor of tomatoes. French marigolds repel nematodes and other soil pests.

Avoid planting brassicas (cabbage, broccoli, cauliflower) near tomatoes, as they can stunt their growth. Fennel inhibits the growth of many plants, including tomatoes. Corn competes with tomatoes for nutrients and can also attract pests.