How to Grow Polaris Tomato
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Polaris Tomato
Solanum lycopersicum 'Polaris'
vegetablePolaris is a determinate (bush-type) tomato variety known for its early maturity and cold tolerance, making it ideal for short growing seasons and northern climates. It produces medium-sized, red, well-flavored fruits and is compact enough for containers or small spaces. This cultivar was specifically bred to set fruit reliably even in cool conditions.
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Example Polaris Tomato timeline · Pittsburgh, PA (Zone 6b)
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Plant Polaris Tomato
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Polaris Tomato
Around Jun 11≈ 55 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Polaris Tomato dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8; exceptionally cold-hardy for a tomato variety
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Seedling
2-3 weeksTiny plants with 2-4 true leaves emerging from seed coat. Fragile but rapidly developing root system.
Keep soil consistently moist but not soggy. Provide 14-16 hours of bright light daily under grow lights positioned 2-3 inches above plants. Maintain temperature of 65-75°F. Thin seedlings to strongest if starting from direct seed.
Vegetative/Establishment
3-4 weeksPlant develops 6-12 true leaves and a stronger root system. Stem thickens and becomes woody. No flowers yet.
Gradually acclimate to outdoor conditions (hardening off) over 7-10 days. Keep soil consistently moist. Begin light fertilizing every 2-3 weeks with balanced fertilizer. Support with small stakes if needed. Pinch off lowest leaves once plant is established.
Flowering
2-3 weeksFirst flower clusters appear, typically 4-6 weeks after transplanting. Plant reaches near-final height (2-3 feet for Polaris). Flowers are small, yellow, clustered.
Maintain consistent watering; inconsistent water causes blossom-end rot. Switch to lower-nitrogen fertilizer (higher phosphorus/potassium) to encourage fruiting. Keep soil temperature warm (at least 55°F at night for fruit set). Remove suckers from determinate varieties minimally.
Fruiting & Development
3-4 weeksSmall green tomatoes develop from flowers and enlarge rapidly. Plant foliage becomes dense. Fruits progress from green to yellow-green, then show red blush.
Water consistently—critical for preventing cracking and rot. Continue fertilizing every 2 weeks with low-nitrogen formula. Prune lower leaves for air circulation and disease prevention. Provide sturdy support as fruit weight increases. Mulch to regulate soil moisture and temperature.
Harvest/Mature Fruit
2-4 weeksTomatoes turn fully red and become soft when gently squeezed. Flavor peaks at full ripeness. Determinate types produce most fruit in concentrated window.
Pick fruits at first sign of red color to encourage more ripening and extend harvest. Harvest before first hard frost. Use vine-ripened or mature green tomatoes. Once determinate variety finishes (typical for Polaris), productivity rapidly declines.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick daily; use Bt (Bacillus thuringiensis) spray; encourage parasitic wasps
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Spray with neem oil or insecticidal soap; use yellow sticky traps; reflective mulch
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Increase humidity; spray with water; use neem oil; encourage predatory mites
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Remove lower infected leaves; improve air circulation; mulch to prevent soil splash; use copper fungicide
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Plant resistant varieties; rotate crops; solarize soil; remove infected plants immediately
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Spray with strong water jet; use neem oil or insecticidal soap; encourage ladybugs
Uses
Fresh eating and cooking
CulinaryPolaris tomatoes are well-suited for fresh eating, slicing in salads, or using in cooked dishes like sauces and soups. Their early maturity makes them valuable in short-season regions where late tomatoes may not fully ripen. [source]
Canning and preservation
CulinaryThe concentrated harvest period of determinate varieties makes Polaris ideal for preservation projects like canning sauce, salsa, or whole tomatoes. [source]
Container and small-space gardening
HouseholdPolaris's compact, bush-type growth habit makes it one of the few tomato varieties suitable for containers, patios, or limited garden space. [source]
Cold-climate gardening
CulinaryPolaris's exceptional cold tolerance and early maturity allow northern gardeners to reliably produce ripe tomatoes in zones 3-4, where standard varieties often fail. [source]
Seed saving
CraftAs an open-pollinated variety, Polaris seeds can be saved, dried, and replanted, providing year-over-year self-sufficiency for gardeners. [source]
Harvest Tips
Polaris is a determinate variety, meaning most fruit ripens in a 2-3 week window. Pick tomatoes when they first show red color; they will fully ripen off the vine and this encourages more fruit production. Harvest before the first frost. For best flavor, allow vine-ripened tomatoes to fully redden on the plant. Ripe fruits yield slightly to gentle pressure. Harvest every 2-3 days during peak season to encourage continued flowering.
Fun Facts
- 🌱 Polaris was specifically bred to set fruit reliably in cool weather by the University of Minnesota breeding program, making it one of the most cold-tolerant tomato cultivars available to home gardeners.
- 🌱 The name 'Polaris' refers to the North Star, reflecting the variety's suitability for northern gardening regions where most tomatoes struggle.
- 🌱 As a determinate variety, Polaris can be productively grown in containers as small as 5-gallon pots, making it ideal for apartment balconies and patio gardens in cold climates.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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