After the Cold: How to Assess Frost Damage in Grapevines

What to Watch for After a Spring Frost Event

A stretch of warm weather followed by a sudden drop in temperature is something most growers are all too familiar with, especially here in the Northeast.

With budbreak underway in many regions, including here in the Finger Lakes, a night dipping into the upper 20s can raise some immediate concerns. While it’s tempting to assess damage right away, what happens in the days following a frost event is just as important as the event itself.

Start with Patience

The first instinct after a cold night is to head straight into the vineyard the next morning. While that’s understandable, visual damage isn’t always immediate.

In many cases, symptoms can take 24–72 hours to fully appear.

Give the vines a little time before making any final calls.

What Frost Damage Looks Like

When temperatures drop low enough to impact early growth, the most common signs of damage include:

• Blackened or darkened primary buds

• Water-soaked or limp young shoots

• Collapsed or shriveled leaf tissue

  
  

Healthy tissue will remain green and firm. Damaged tissue often turns dark and soft as it begins to break down.

Primary vs. Secondary Buds

One of the most important things to remember is that grapevines have built-in redundancy.

If primary buds are damaged, secondary buds can still push.

However, secondary shoots:

• Are typically less fruitful

• May result in reduced yield

• Can create a more uneven canopy

  
  

This is why early frost events don’t always mean a total loss, but they can influence the season ahead.

Assessing the Extent of Damage

As you walk your vineyard, look for patterns:

• Is the damage consistent across the block, or limited to low spots?

• Are certain varieties further along and more affected?

• Are shoots on one side of the row more impacted than the other?

Variability is common, especially in sites with elevation changes or air drainage differences.

What to Do Next

After assessing the damage, the best next steps are often the simplest:

• Hold off on immediate pruning adjustments until you see how the vine responds

• Allow time for secondary bud growth to emerge

• Avoid overcorrecting too quickly, especially if damage is inconsistent

  
  

In most cases, vines will begin to show how they plan to recover within a week or so.

A Season That Keeps You Guessing

Spring frost is one of those reminders that vineyard management is never static. Each season brings its own set of challenges, and no two years look exactly the same.

For those experiencing early budbreak this year, this is simply one more moment to observe, adapt, and respond as the season unfolds.

If you’re seeing something unusual in your vineyard or aren’t sure what you’re looking at, feel free to reach out. These are the moments where shared experience across the industry really matters.

Frost Damage vs Healthy Growth on Grapevines