Cherry Tomatoes in Zone 7B — Pacific Northwest

Cherry tomatoes are absolutely perfect for our mild Pacific Northwest summers, giving you bucket loads of sweet, concentrated flavor that puts store-bought varieties to shame. They're actually better suited to our climate than large slicing tomatoes since they ripen faster and don't need the extended heat that rarely arrives here. Our cool nights help develop incredible flavor complexity, and the continuous harvest from summer through fall means fresh tomatoes for months.

Yes, tomatoes can feel challenging in our region with our cool spring soils and relatively short warm season, but cherry varieties are much more forgiving than their large cousins. With our 193-day growing season and proper timing, you'll have plenty of time for multiple rounds of fruit before our first frost in late October. The key is getting started indoors at the right time and being patient with our slow spring.

Start your cherry tomato seeds indoors from mid-March through early April, about 6 weeks before you plan to transplant outside. This timing works perfectly with our slow Pacific Northwest springs, giving your seedlings time to develop strong root systems while the soil gradually warms up outside.

Set up seed trays with quality seed starting mix and keep them warm - around 70-75°F for best germination. A heating mat helps tremendously during those overcast spring days when indoor temperatures fluctuate. Once seedlings emerge, they need bright light either from a sunny south window or grow lights positioned 2-3 inches above the leaves.

Bottom watering works best for tomato seedlings since it prevents damping off disease. Place seed trays in shallow pans of water and let the soil wick up moisture from below. This keeps the surface drier while ensuring roots get consistent moisture.

Wait until late April through late May to transplant your cherry tomatoes outside, when nighttime temperatures consistently stay above 50°F and soil has warmed to at least 60°F. Our wet springs mean soil stays cool longer than the calendar suggests, so don't rush this step even if the air feels warm.

Plan for a week of hardening off before transplanting. Start with 2-3 hours outside in a protected spot, gradually increasing time and sun exposure. Our variable spring weather with sudden wind or temperature drops means seedlings need this gradual adjustment period.

Space plants 24-36 inches apart to allow good air circulation, which is especially important in our region where late blight can be a concern. The wider spacing helps plants dry out faster after our frequent spring rains and gives you room to mulch effectively around each plant.

Cherry tomatoes need consistent moisture throughout the growing season, and this is where timing your watering to our dry summer climate really matters. Once our wet spring ends (usually by late May), you'll need to take over irrigation duties completely since we rarely see meaningful rain until fall.

During our dry summer months, plan to water deeply 2-3 times per week, providing about 1-2 inches total. The finger test works perfectly - stick your finger 2 inches into the soil near the plant base. If it's dry at that depth, it's time to water. Cherry tomatoes are particularly prone to cracking when watering is inconsistent, so maintaining that steady moisture level is crucial.

Always water at the base of plants rather than overhead, especially during our dry summer period when humidity stays low. This prevents water from sitting on leaves (reducing disease risk) and ensures water goes directly to roots where it's needed. Morning watering works best since plants can dry off during the day.

A 2-3 inch layer of mulch around plants helps tremendously in our climate. It keeps soil moisture consistent during our dry spells and prevents that dramatic wet-dry cycle that causes cherry tomatoes to split. Straw, shredded leaves, or grass clippings all work well in our mild summer conditions.

Cherry tomatoes are vigorous indeterminate growers that absolutely need strong support from day one. Tall cages (at least 6 feet) or sturdy stakes work best since these plants will easily reach 6-8 feet tall by season's end in our long growing season. Install support at planting time to avoid disturbing roots later.

For stakes, use 8-foot tall posts driven 18 inches deep and tie plants loosely with soft fabric strips every 12 inches as they grow. Cages should be heavy-gauge wire that won't buckle under the weight of a fully loaded plant in late summer. Those flimsy store-bought cages simply won't cut it for indeterminate cherry varieties.

Train plants by gently weaving main stems through cage openings or tying to stakes weekly during peak growing season. Our mild summers mean steady, consistent growth rather than explosive spurts, so regular training keeps plants manageable and prevents breakage during our occasional summer windstorms.

Remove suckers (shoots growing between main stem and branches) regularly, especially the lower ones that develop below the first flower cluster. This improves air circulation around the plant base, which is particularly important in our region where moisture can linger and encourage fungal problems like early blight.

Unlike large tomato varieties, you can leave more upper suckers on cherry tomatoes since the small fruits ripen quickly and don't require as much plant energy. Focus your pruning efforts on the bottom third of the plant and any growth touching the ground. Remove yellowing lower leaves throughout the season to maintain good airflow.

As we approach our first frost in late October, top the plants (pinch growing tips) in early to mid-September. This directs the plant's energy into ripening existing fruit rather than producing new flowers that won't have time to mature. Remove any obviously diseased foliage but leave healthy leaves that are feeding developing fruit.

Your first cherry tomatoes will be ready from late June through mid-August, about 60 days from transplanting. Look for fruit that's fully colored and gives slightly to gentle pressure - many cherry tomatoes will actually pop right off the vine cluster with a light tug when perfectly ripe.

Harvest every 2-3 days during peak season since cherry tomatoes ripen quickly in clusters. Pick them when they're fully colored but still firm if you want them to last longer, or wait until they're slightly soft for immediate eating. Regular picking encourages continued production throughout our long mild fall.

As we head toward late October and potential frost, harvest all remaining fruit regardless of ripeness. Green cherry tomatoes ripen well indoors on a windowsill or in paper bags with a ripe apple. You can also pull entire plants and hang them upside down in a garage or basement - the fruit will continue ripening for several more weeks.

Our extended mild fall often gives you extra harvest time that gardeners in harsher climates don't get. Cherry tomatoes will keep producing until that first hard frost, sometimes giving you fresh fruit well into October if you protect plants during light frost warnings.

Cracking appears as either circular rings around the stem end or radial splits running from top to bottom of the fruit. You'll often see this after our occasional late summer rain showers or if you've let plants get too dry between waterings. Cherry varieties are particularly prone to this since their thin skins can't expand as quickly as the fruit flesh when they suddenly absorb water.

Blossom end rot shows up as sunken, dark brown or black leathery patches on the bottom end of fruit. This isn't a disease but a calcium uptake problem caused by inconsistent watering - something that's easy to fall into during our transition from wet spring to dry summer. The first fruits of the season are often affected most.

Early blight starts as brown spots with distinctive concentric rings (like a bullseye) on lower leaves first, then spreads upward. Leaves turn yellow and drop off progressively. This fungal disease loves the combination of warmth and moisture, and can be problematic during our wet springs when soil stays damp and air circulation is poor.

Hornworms will strip large sections of leaves seemingly overnight, leaving behind dark green droppings. These large green caterpillars with white diagonal stripes can be up to 4 inches long and blend in perfectly with tomato foliage. Look for the damage first, then search carefully for the culprits.

Pacific Northwest Specific Challenges: Our mild summer temperatures and dry conditions actually work in favor of cherry tomatoes compared to regions with brutal heat and humidity. However, late blight can be a serious concern during wet springs - ensure good spacing and avoid overhead watering. Slugs love young transplants during our damp spring weather, so use copper barriers or organic slug bait around newly planted seedlings until they're established.

Basil planted near cherry tomatoes helps repel aphids and whiteflies while improving the tomatoes' flavor - plus you'll have fresh basil for all those cherry tomatoes you'll be harvesting. Carrots make excellent use of space between widely-spaced tomato plants and their deep roots don't compete with tomato roots. Parsley attracts beneficial insects that prey on tomato pests, and marigolds release compounds that deter nematodes and other soil-dwelling pests.

Avoid planting brassicas like cabbage or broccoli near tomatoes since they can stunt each other's growth through chemical interactions in the soil. Fennel inhibits tomato growth, and corn attracts similar pests (like hornworms) while providing no benefits. In our Pacific Northwest gardens where space is often limited, stick with companions that either actively help your tomatoes or make efficient use of the space between plants.