10/23/2026
Frost is in the Forecast! Is Your Garden Ready?
The National Weather Service has issued a frost advisory for Portland tonight, so it’s time to give your garden’s tender plants a little extra attention.
What Happens When Frost Arrives?
Frost can damage cells within leaves and stems of tender plants, leaving foliage wilted, discolored, or blackened. Some plants recover from a light frost, while others may suffer permanent damage.
Which Plants Need a Little Help?
Warm-season favorites like tomatoes, peppers, basil, begonias, and coleus are especially sensitive to cold temperatures. Tropical plants and tender annuals also deserve some extra attention.
On the other hand, many familiar fall favorites are well equipped to handle chilly weather. Pansies, ornamental kale, cabbage, and many hardy perennials can tolerate light frost. In fact, cold weather can even improve the flavor of certain vegetables—including kale!
Simple Ways to Protect Your Plants
Cover vulnerable plants. Lightweight frost cloth, old bedsheets, or breathable blankets can help trap warmth rising from the soil. Drape covers down to the ground and secure them before temperatures fall.
Protect your containers. Potted root systems are more susceptible to cold weather damage than those growing in the ground. Grouping containers together in a sheltered location—like a garage, or greenhouse—can provide some added protection. If you’re bringing them inside your home, remember to check plants for pests.
Remove covers in the morning. Once temperatures rise above freezing, uncover your plants to allow sunlight and airflow to return.
A Little Frost Isn’t the End of the Garden
If you find frost damage, don’t start pruning away. Damaged foliage may look discouraging, but waiting until the extent of the injury becomes clear can help you avoid removing healthy growth.
And remember, autumn is still a wonderful time to garden in the Pacific Northwest! Cooler temperatures and seasonal rainfall create excellent conditions for establishing many trees, shrubs, and hardy perennials.
So grab a cozy sweater and enjoy the changing season. There’s still plenty of gardening to do!