« This is Severe Weather Preparedness Week for Indiana. Tornado Drill Tomorrow. | Main | What Does This Martian Volcano And Dinosaurs Have In Common? »


LAST FREEZE? When The Final Freeze Of The Season Typically Occurs & Looking At The Rest Of April...


We haven't had much of a spring this April with only 4 days in the 80's and temperatures running over 5 degrees below normal for the month. A lot of people are getting eager to plant so let's look at when the last freeze of the season typically occurs. Remember, the last freeze can vary greatly from year to year, but the maps below should give you a rough idea of the average dates... 


Last spring hard freeze (28°):  March 24


Image Credit: NOAA

Last spring freeze (32°):  April 5


Image Credit: NOAA

Last spring frost (36°):  April 18


Image Credit: NOAA

Obviously, this spring is running way behind schedule. We just had a Freeze Warning on Tuesday and a Frost Advisory goes into effect tonight. Has this happened before? Yes, and to emphasize the variability of these dates, check out some of these records of the latest/earliest frost, freeze and hard freeze... 

Latest spring frost (36°):  May 27, 1961
Latest spring freeze (32°):  May 10, 1966
Latest spring hard freeze (28°):  April 23, 1986
Earliest final spring frost (36°):  March 15, 1884
Earliest final spring freeze (32°):  March 5, 1927
Earliest final spring hard freeze (28°):  February 19, 1905

That's why the rule of thumb for our area is to always wait until after Derby before planting anything. The Global Ensemble Forecast System (GEFS) 2-m temperature anomaly maps keep temps below normal with a sign that the cool air loosens it's grip on our area near the end of April. This would allowing numbers to get closer to average which at that point would be well into the 70's. The ECMWF Ensemble Prediction System (EPS) has other plans moving into May with consistent shots of cooler air from time to time. Either way, this cool pattern appears to last through much of spring... 


Image Credit: WxBell


Image Credit: WxBell

Final thoughts... I doubt we have to deal with another hard freeze, but freeze warnings are still possible in rural areas. For Louisville, don't be shocked if we have a couple more frost advisories this spring. Join Marc and I on WDRB at 10 & 11 for the latest Thunder Over Louisville forecast.



-Rick DeLuca




Feed You can follow this conversation by subscribing to the comment feed for this post.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment