What is the coldest temperature tomato plants can handle, is a worrying matter that also bears repeating as sometimes, we need to remember. The lowest temperature tomatoes can tolerate is what they will handle the extreme point, but not beyond that.Temperature for Tomato Plants In short, it doesn’t mean that they’ll still be productive at this point or anywhere below it. Let’s explore how temperatures influence the overall growth of tomato plants.

What Is the Coldest Temperature That Tomato Plants Can Handle?

Quick Answer

Tomato plants have their temperature tolerance because once the mercury drops to 32 degrees Fahrenheit, things get stressful.


At the same time, once the weather reaches below 40 degrees Fahrenheit, the effects start to show that the plant is not establishing well.

– Growing Tomatoes at Low Temperatures

These plants are ones that tolerate temperatures until 32 degrees Fahrenheit, which means this is where tomato plants survive.  You’ll notice stunted growth, leaves that look a little wilted, and even some unsightly pitting on the fruits. While some tomato varieties are grown to withstand cold, prolonged exposure could kill them.

To give you an idea, the cold weather can put a damper on tomato plant growth, especially when they drop below 40 degrees Fahrenheit. These chilly conditions mess with the plant’s inner workings and important processes like photosynthesis and nutrient absorption. It’s no surprise then that the plants’ overall development and growth rate take a hit.

The best temperature for tomato seedlings and mature plants ranges from 65 to 85 F. These temperatures are perfect for their growth, allowing them to photosynthesize efficiently and produce healthy fruits with strong root systems. Grown in ideal temperature conditions, tomatoes thrive with robust growth, abundant flowering, and optimal fruit development.

What Are Signs That Tomato Is Under Cold Temperature Stress?

Signs that tomato is under cold temperature stress are when they lack proper pollination process, and they start to show injuries as they grow. In addition, you may also see that the fruit they grow seem weak when they are growing.Tomato Under Cold Temperature

– Lack of Pollen

if temperatures drop below 50 degrees Fahrenheit, pollen production takes a hit. That means fewer bees doing their pollination magic, and, consequently, reduced fruit set. Extended exposure to temperatures below the 50 F threshold can spell trouble in the form of chilling injury for your tomato plant.

– Appearance of Injuries

Chilling injury is like a cellular meltdown caused by low temperatures, especially on cold nights. It damages the plant’s tissues and throws off its normal functions. Look out for some telltale signs like discolored leaves in dark green, purple, or bronze shades.

In addition to this, don’t be surprised if those chilled-out tomato plants start wilting, even with enough moisture in the soil. Cold temperatures mess with their water uptake and transport systems, you see. With growth impeded, these plants can end up looking smaller and less robust than their counterparts enjoying optimal temperatures.

– Looking Weak

A chilled tomato plant tends to have reduced vigor overall. They appear weaker and more susceptible to diseases and pesky pests. As if that’s not enough, the cold can seriously damper flower formation.

You might see delays or even a lack of flowers altogether, which directly impacts the chances of fruitful success. Worse, you might kill tomato plants you’ve worked hard to grow.

Unfavorable temperatures ensure that the fruits undergo the worst development. The flowers are not properly pollinated, and the fertilized ovaries develop into plump, unhealthy fruits that gradually enlarge, undergoing the necessary processes to reach maturity.

As a result, tomatoes grown in extremely cold temperature conditions tend to exhibit weak quality. They’re more likely to have an undesirable texture, flavor, and color profile. The fruits are unevenly ripened.

What Are Ways To Shield Tomatoes from Colder Temperatures?

The ways to shield tomatoes from colder temperatures are to place some row covers, and use protective cloches; you can also place some greenhouse for their safety. In addition, you may try to mulch them, be keen on the water management, place covers, and tents, and have detailed timing.

– Row Covers

When it comes to safeguarding your tomato plant, row covers are your go-to solution. These nifty covers, made of lightweight fabrics or plastic, create a shield against cold air while still allowing sunlight, air, and water to reach the plants. Simply drape the row covers over your tomato plant and secure them to the ground or plant supports for maximum effectiveness.

– Cloches

Cloches are a fantastic option if you want to protect individual tomato plants. Cloches act like mini-greenhouses, enveloping the plants and trapping heat to create a cozy environment. You can fashion cloches using glass jars, or plastic bottles with the bottoms cut off, or purchase specialized plastic cloches designed for plant protection.Shield Tomatoes from Cold

– Greenhouses

Consider growing your tomatoes in a greenhouse for the utmost protection against low temperatures. These controlled environments allow you to regulate temperature, humidity, and other crucial factors.

Greenhouses retain heat and provide an ideal haven, shielding plants from frost and extreme cold. Greenhouses are a reliable choice whether you’re a home gardener or a commercial producer.

– Mulching

Mulching is a simple but highly effective method to keep your tomato plant cozy and shielded from temperature swings. For this, you can simply lay down a nice layer of organic mulch like straw, hay, dried leaves, or compost around the base of your plant.Mulching around Tomato Plants

This natural cover acts like a snug blanket, preventing heat from escaping the soil and controlling temperature variations. Plus, it works wonders in retaining moisture, which is a big win for your plant’s overall well-being. Embrace mulching, and your tomatoes will thank you for their thriving growth.

– Water Management

Proper watering practices play a significant role in protecting your tomato plant from the cold. Well-hydrated plants are more resilient to cold stress, so you know so well what temperature will kill tomato plants and aim to avoid their death.

However, be mindful not to overwater, as excessively wet soil can lead to issues like root rot. You may try to water your plants early in the day, allowing ample time for the foliage to dry before temperatures drop, minimizing the risk of frost damage.

– Place Covers and Tents

If you want an extra layer of insulation and protection against frost, consider using specialized plant covers or tents that will protect the fruitfulness of the plant. These purpose-built covers are made of insulating materials and can be placed over individual plants or small groups. They provide an added buffer against the cold and help maintain a favorable microclimate.

– Timing

To prevent exposing your tomato plants to colder temperatures, it’s essential to time your planting correctly. Wait until the risk of frost has passed in your region. Seek guidance from local gardening resources, agricultural extension services, or experienced gardeners in your area to determine the ideal planting time for tomatoes.

What Is the Warmest Temperature That Tomato Plants May Handle?

The warmest temperature that tomato plants may handle is when it rises above 90 degrees Fahrenheit. In addition, this is when you will see the plantation weakening, the flowers dropping, and the fruits starting to ripen in an uneven way.

When the temperature rises above 90 degrees Fahrenheit, tomato seedlings and plants may encounter challenges in their reproductive processes, decreasing flower formation. The scorching heat disrupts the plant’s ability to produce an adequate number of flowers, thereby reducing the likelihood of fruitful pollination and ultimately leading to lower yields.

The impact of high temperatures goes beyond flower formation. Pollen, essential for successful pollination, can suffer from reduced viability and quality under such conditions.

– Incomplete Pollination

The heat can cause pollen to become sticky or dry, impairing its ability to adhere to the female parts of the flowers and fulfill its fertilization role. As a consequence, incomplete pollination occurs, resulting in a diminished fruit set.

– Underdeveloped Looking Flowers

Another consequence of prolonged exposure to high temperatures is the occurrence of blossom drop. Tomato plants may shed their flowers prematurely when consistently faced with temperatures surpassing 90 degrees Fahrenheit.Flowers of Tomato Plants

This shedding of flowers is a protective mechanism employed by the plant to conserve energy and resources during unfavorable environmental conditions. However, this phenomenon significantly reduces the potential yield of tomatoes.

– Weak-looking Fruits

Furthermore, extreme heat can negatively impact the quality of tomato fruits in various ways. Firstly, it can cause uneven ripening, resulting in fruits with irregular coloration and inconsistent texture. Moreover, the combination of intense sunlight and high temperatures can lead to sunscald on exposed areas of the fruits.

– Damaged Exterior

Sunscald manifests as yellow or white patches, which later turn brown or black, leading to damaged or spoiled areas. Consequently, the appearance of the fruits is compromised, and there is an increased risk of rotting.

Lastly, heat stress can adversely affect the flavor and texture of tomatoes. Fruits subjected to prolonged high temperatures may exhibit a blander or less desirable taste and a softer, mushier texture due to higher water content.

In this case, the plant is growing weakly, so when tomato plants are grown in their stressed temperature range, they experience weaknesses when developing their fruits. This allows the plants to allocate less energy towards growth and fruit production, as they aree combating unfavorable environmental conditions.


Tomatoes can be grown in a wide range of temperatures, but we still need to remember that they grow best in warm, sun-lit environments, so here’s a quick recap for everything we’ve covered so far:

  • Tomatoes can tolerate temperatures as low as 33 F, but may not be healthy or productive at this point, so try to avoid exposing them to 32 degrees Fahrenheit; so at this point, they are beyond saving.
  • There are effective methods to protect tomato crops from the cold and ensure their healthy development.
  • It’s always best to grow tomatoes in temperatures from 65 to 85 F.
  • Shield tomatoes from low temperatures by using row covers, cloches, mulch, and other forms of protection.

Now that you know the coldest temperature for your tomato plant, you can take the appropriate actions to ensure they live to give you a bountiful harvest!

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