Why Are My Tomato Leaves Rolling? It could be heat stress, not disease!
This tomato plant (above) looked fine a couple weeks ago, but this Denver garden has had highs of over 95˚ F ever since, and you can see from it's rolling leaves that it is suffering from the heat.
Noticing your tomato leaves curling or rolling upward in this super hot summer heat? Did the tomato plants look fine a couple weeks ago before the heat-wave? Don’t worry, this is often a natural response called physiological leaf roll, not a sign of disease or pests.
How to support your tomatoes during extreme heat stress:
- Water deeply and consistently to maintain even soil moisture
- Add 2–3 inches of organic mulch to keep roots cool and reduce evaporation
- Skip heavy pruning during hot spells—leaves help shade and protect the plant
- If you can, use shade cloth during extreme heat waves, find it at your local hardware store or garden center
- Feed appropriately, but avoid excess nitrogen that encourages overly lush growth
When temperatures climb, especially in hot, dry climates like Colorado, tomato plants can lose moisture faster than their roots can keep up. To protect themselves, the leaves roll upward, reducing sun exposure and slowing water loss. It’s simply your plant’s built-in way of coping with stress.
Common triggers include hot afternoons (over 90°F), dry winds, inconsistent watering, root disturbance, or heavy pruning that leaves plants exposed to intense sun.
The reassuring part:
This type of leaf roll usually doesn’t affect fruit quality or your harvest.
Will the leaves recover?
As temperatures cool and watering becomes more consistent, new growth should return to normal. The rolled leaves may stay curled, but your plant can continue to thrive.
In sunny, high-desert conditions, a little leaf rolling is often just your tomato plant doing its job, it's protecting itself so it can keep producing delicious fruit for you.
Above: The tomato on the right is suffering and rolling it's leaves, while the tomato on the right is still green, despite the 97˚ F heat in this Denver garden. It could be that the cherry tomato on the right is a Super Sweet 100 tomato, which can be more resilient in super hot & dry heat.
Heat Tolerant Tomatoes
Some tomato varieties are more resilient to heat stress than others, check out our Top Heat Tolerant Tomatoes »
Stay cool out there.
