Can Blueberries Tolerate Frost

Blueberries can tolerate frost, but how much they tolerate depends on the stage of growth and the variety you’re growing.
 
If you’ve been wondering whether blueberries can tolerate frost, the short answer is yes for dormant plants, but open blossoms and young shoots are a different story.
 
Frost tolerance in blueberries varies widely, so knowing your plant’s stage of development helps you protect your harvest.
 
In this post, we’ll look at how well blueberries tolerate frost, when frost becomes a real threat, and what you can do to keep your bushes safe.
 
Let’s dig in.
 

Can Blueberries Tolerate Frost? Here’s the Truth

Blueberries can tolerate frost during dormancy, and many varieties survive temperatures well below freezing while they’re fully dormant.
 
But once the growing season kicks in, that tolerance drops fast.
 
Here’s what’s actually happening when frost hits your blueberry bushes.
 

1. Dormant Blueberries Tolerate Frost Easily

During winter dormancy, blueberry plants can tolerate frost without any trouble at all.
 
Most varieties handle temperatures down to -20°F or even lower when they’re fully dormant.
 
The plant shuts down above-ground growth and focuses energy on its roots and crown.
 
This is why blueberries can tolerate frost so well in cold climates like Maine, Michigan, and parts of Canada.
 

2. Open Blossoms Are Highly Vulnerable

Once blueberries break dormancy and start blooming, frost tolerance takes a nosedive.
 
Open flowers can be damaged or killed at temperatures around 28°F.
 
And if temps drop to 24°F, you can lose most of your blossoms in a single night.
 
Since each blossom is a potential berry, frost during bloom can wipe out a big chunk of your harvest.
 
So while blueberries can tolerate frost when dormant, they can’t tolerate frost once flowers open.
 

3. Tight Buds Handle Frost Better Than Open Ones

The stage of bud development matters a lot for frost tolerance in blueberries.
 
Tight, unopened buds can handle temperatures down to the low 20s without major damage.
 
As buds swell and open, that threshold rises quickly.
 
By the time you see full bloom, frost tolerance drops to around 28°F.
 
That’s why late frosts in spring are the biggest enemy for blueberry growers.
 

When Frost Becomes a Real Threat to Blueberries

Frost becomes a real threat to blueberries when it hits during bloom or right after fruit set.
 
Here’s how to know when you need to act.
 

1. Late Spring Frosts Are the Worst

A late spring frost can damage blueberry blossoms even if your plants sailed through winter without a scratch.
 
These frosts often arrive after a warm spell that pushed your bushes into early bloom.
 
That combination of warm days followed by a sudden freeze is what catches blueberries off guard.
 

2. Low-Lying Areas Get Hit First

Cold air sinks, so blueberry bushes planted in low spots, valleys, or frost pockets are more vulnerable.
 
If your bushes sit on a slope or higher ground, they may tolerate frost better than plants in a dip.
 
Keep this in mind when you’re deciding where to plant new blueberry bushes.
 

3. Windy Nights Make Frost Worse

Wind strips away the thin layer of warmth around blueberry blossoms, which lowers their frost tolerance even more.
 
A windy frosty night can do far more damage than a still one.
 
So pay attention to both temperature and wind when frost is in the forecast.
 

How to Help Blueberries Tolerate Frost Better

Since blueberries can tolerate frost in some stages but not others, protecting them during vulnerable periods is key.
 
Here are the most effective ways to help your bushes get through a frosty night.
 

1. Cover Your Bushes at Night

Draping frost blankets or old bedsheets over your blueberry bushes can raise the temperature around the blossoms by a few degrees.
 
That small bump is often enough to keep your flowers from freezing.
 
Just make sure the cover reaches the ground so heat from the soil stays trapped underneath.
 
Remove the covers in the morning so pollinators can get back to work.
 

2. Water the Soil Before Frost Hits

Moist soil holds heat better than dry soil, so watering the day before a frost can help blueberries tolerate frost more effectively.
 
Well-hydrated plants also handle cold stress better in general.
 
Water in the morning or early afternoon so the soil has time to absorb it before the cold arrives.
 

3. Choose Frost-Hardy Varieties

Some blueberry varieties tolerate frost better than others, especially during bloom.
 
Northern highbush varieties like Bluecrop and Patriot are known for blooming later and handling cold snaps well.
 
Rabbiteye and southern highbush types are more sensitive and better suited to warmer regions.
 
If frost is a yearly worry where you live, planting late-blooming varieties is one of the smartest moves you can make.
 

4. Avoid Early Spring Fertilizing

Feeding your blueberries too early in spring pushes new growth and early blooms, which makes them more vulnerable to frost damage.
 
Wait until the danger of frost has passed before you fertilize.
 
This keeps your plants in step with the season and reduces the chance of losing blossoms.
 

So, Can Blueberries Tolerate Frost?

Blueberries can tolerate frost when they’re dormant, and most varieties shrug off cold winter temperatures with ease.
 
But once blossoms open in spring, frost tolerance drops quickly, and a single cold night can cost you your entire harvest.
 
The good news is that a little preparation, like covering your bushes and choosing late-blooming varieties, goes a long way.
 
So yes, blueberries can tolerate frost, as long as you know when to step in and protect them.