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Frost can hurt blackberry plants, especially if it arrives when they’re actively growing or blooming.
But whether frost will hurt your blackberry plants depends on a few key things.
If you’ve been wondering “will frost hurt blackberry plants,” the answer is yes — frost can hurt blackberry plants under the right conditions.
Cold temperatures can damage tender new growth, kill flower buds, and even set your plants back for the entire season.
The good news is that blackberry plants are tougher than they look, and with a little know-how, you can protect them.
In this post, we’ll look at whether frost will hurt blackberry plants, when they’re most at risk, and what you can do about it.
Let’s dig in.
Will Frost Hurt Blackberry Plants?
Yes, frost will hurt blackberry plants when the timing and temperature are wrong.
Blackberry plants are perennial, meaning they come back year after year from the same root system.
That root system is usually hardy and survives cold just fine.
The problem is the above-ground growth, which is far more sensitive to frost.
Here’s why frost can hurt blackberry plants:
1. Tender New Growth Is Vulnerable
When blackberry plants break dormancy in spring, they push out soft, tender new canes and leaves.
This new growth has a high water content and no hardened defenses against cold.
When frost hits, ice crystals form inside the plant cells.
Those ice crystals puncture cell walls, and the tissue dies.
That’s why frost will hurt blackberry plants that have already started growing but not dormant ones.
2. Flower Buds and Blossoms Are the Most Sensitive
If frost arrives while your blackberry plants are budding or blooming, that’s the worst-case scenario.
Open flowers and swollen buds are the most frost-sensitive parts of the plant.
A light frost can damage blackberry blossoms, and a hard freeze can wipe them out completely.
And no flowers means no blackberries that year.
So frost will hurt blackberry plants most severely when it lands during bloom.
3. Dormant Plants Handle Frost Fine
Here’s the flip side: when blackberry plants are fully dormant in winter, frost usually won’t hurt them.
Dormant canes have lower water content and built-in cold hardiness.
Most blackberry varieties tolerate winter temperatures well below freezing without issue.
So frost in mid-winter typically won’t hurt blackberry plants that are asleep for the season.
The danger zone is spring and early fall, when growth is active.
When Frost Is Most Likely to Hurt Blackberry Plants
Timing is everything when it comes to frost damage on blackberry plants.
The risk is highest in two windows.
1. Early Spring Cold Snaps
A late freeze after a warm spell is the classic frost scenario that hurts blackberry plants.
Warm days push your plants into active growth, then a sudden cold night catches them off guard.
This is when frost will hurt blackberry plants the most.
A single freezing night during this window can blacken leaves and kill buds.
2. Early Fall Frost
Fall frost can also hurt blackberry plants, particularly primocane varieties that fruit on first-year canes.
If those canes are still ripening fruit when frost hits, the berries and tips can be damaged.
It’s usually less severe than spring damage, but it can still cut your fall harvest short.
How to Protect Blackberry Plants From Frost
You can’t control the weather, but you can absolutely reduce how much frost will hurt blackberry plants.
Here’s what works.
1. Cover Plants Overnight
Draping a frost blanket, sheet, or row cover over your blackberry plants traps heat from the soil.
This simple step can keep temperatures a few degrees warmer around the plant.
Just remove the cover in the morning so the plants can breathe and get sunlight.
2. Water the Soil Before a Freezing Night
Moist soil holds heat better than dry soil.
Watering deeply the day before a frost can help protect blackberry plants by releasing warmth overnight.
Avoid wetting the foliage, though, since wet leaves freeze faster.
3. Choose Cold-Hardy Varieties
Some blackberry varieties are bred to handle cold better than others.
If frost is a recurring problem where you live, planting cold-hardy types reduces how much frost will hurt blackberry plants long-term.
Varieties like ‘Chester’ and ‘Illini Hardy’ are known for their cold tolerance.
4. Delay Pruning to Avoid Early Growth
Pruning encourages blackberry plants to push new growth.
If you prune too early in spring, you’re basically inviting frost to hurt blackberry plants.
Wait until the risk of frost has passed before you prune.
So, Will Frost Hurt Blackberry Plants?
Frost will hurt blackberry plants when it hits active growth, especially during blooming.
But frost usually won’t hurt blackberry plants that are fully dormant in winter.
The key is knowing your timing, watching the forecast, and being ready to cover or water when a cold night sneaks in.
Do that, and a little frost won’t steal your blackberry harvest.
And that’s really what matters most.