North Texas hail and heat season guide: when the storms and the 100-degree days arrive in Dallas–Fort Worth

Every contractor in Dallas–Fort Worth knows the region has a hail season and a heat season. Fewer have a dated, sourced calendar of when each one actually shows up. This guide puts ten years of federal hail reports for Dallas, Tarrant, Collin and Denton counties next to the National Weather Service’s count of 100-degree days at DFW. It is written for roofing, HVAC, foundation and restoration companies planning crews and phones for the year ahead. Trade groups, chambers and local reporters are welcome to cite it.

Every number below comes from the public sources linked on this page. The hail counts are our own tally of NOAA’s public files, and the method is spelled out so anyone can repeat it.

Where the hail numbers come from

The National Oceanic and Atmospheric Administration keeps a national record of severe weather called the Storm Events Database. Its records are entered by the National Weather Service, according to NOAA’s own description of the dataset. That description also notes that some information is not verified by the Weather Service, so treat individual entries as reports rather than measurements made in a lab.

NOAA publishes the full database as one downloadable file per year in a public folder of bulk details files. We counted every hail entry for Dallas, Tarrant, Collin and Denton counties in the yearly files for 2016 through 2025, using the newest version of each year’s file posted when we ran the count. That came to 1,344 hail reports over ten years.

What a “report” means

A report is one observation of hail from one place at one time. It is not one storm. A single line of storms crossing Tarrant County on an April evening can produce several reports as it moves from town to town. A quiet year with one huge storm can look smaller in the counts than a busy year of modest storms.

Reports also depend on someone being there to see the hail and pass it on, so a county with more people out to see it may log more reports for that reason alone. Read the counts as a picture of when and where hail tends to be noticed, not as a damage estimate.

How to repeat the count

Anyone can check these numbers with a spreadsheet:

1. Open NOAA’s bulk files folder and download the yearly “details” file for each year from 2016 to 2025, then unzip it. Each file name includes its year.
2. Open each file and keep only the rows where the state is Texas and the event type is hail.
3. Keep the rows for the counties named Dallas, Tarrant, Collin and Denton.
4. Count the rows by the month and year the event began, and by county. The magnitude column holds the hail diameter in inches.

NOAA revises past years from time to time and posts a new version of the file when it does. If your count differs by a few reports from ours, a newer file is the most likely reason.

Hail reports by month

The pattern is hard to miss. March through June held 1,169 of the 1,344 reports, or about 87% of all hail reports in the four counties over the ten years, by our count of NOAA’s Storm Events files. April alone had 363. Then hail nearly stops: July had just 7 reports across ten years, the fewest of any month except December.

There is a smaller second bump in the fall. September logged 55 reports, more than any month from July through February. It is a fraction of the spring total, but it is enough that a roofing company planning a slow autumn should not count on one.

Hail reports by county

For scale, the National Weather Service’s hail chart for observers compares 1.75-inch hail to a golf ball and 2-inch hail to a hen egg. Across the four counties there were 204 reports of hail 2 inches or larger in ten years.

Tarrant County had the most reports overall. Collin and Denton, with fewer reports in total, each logged more reports of 2-inch hail than Tarrant did. Dallas County had the fewest reports in every column. That does not mean Dallas roofs are safe. Its largest stone, 4 inches on June 12, 2023, came on the same date as Tarrant’s 5-inch report.

June 2023 stands out. Three of the four county records in this table fell within four days of each other that month, including Denton County’s 5.9-inch report on June 15.

Hail reports by year

The yearly totals swing widely. The quietest year in the set was 2020 with 81 reports. The busiest was 2024 with 253, more than three times as many. The years 2023 and 2024 were the two busiest back to back.

Ten years is too short a span to call a trend, and changes in how many people report hail can move these numbers along with the weather. What the table does show is that a “normal” hail year in DFW is a range, not a number. A company that sized its spring around 2020 would likely have been short of people and phone coverage in 2024.

When the heat arrives

Hail fades out in July, and the heat takes over. The National Weather Service office in Fort Worth keeps a summary of 100-degree days at DFW going back to 1899.

Those days cluster tightly. The same summary shows most 100-degree days falling in July and August. The average first 100-degree day is July 1 and the average last is August 27.

The averages hide the bad years. The record is 71 days of 100 degrees or hotter, set in 2011. The longest run of consecutive 100-degree days is 42, from June 23 to August 3, 1980. The earliest 100-degree reading on record came in 1911 on March 9. The latest came in 1951 on October 3. In other words, 100-degree heat has shown up as early as March and as late as October.

What the calendar means for crews and phones

Put the two seasons side by side and the North Texas contractor year has a clear shape. Here is what it tends to mean month by month for the people answering the phone and the crews running the jobs.

January and February. Hail is rare, with 44 reports between the two months over ten years. This is the window for hiring, training and getting the office ready before spring.

March through June. This is hail season, and the work arrives in bursts rather than a steady stream. A storm crosses Collin County on a Tuesday night, and by Wednesday morning roofing offices in Plano can open to a voicemail box full of homeowners asking for an inspection. Restoration companies may hear from the same neighborhoods. A homeowner who reaches voicemail can simply call the next roofer on the list, and a callback on Thursday may find the job already promised to someone else.

July and August. The calls change from roofs to air conditioners. With most of DFW’s 100-degree days falling in these two months, an HVAC company can go from a manageable week to every tech booked in a single afternoon. Picture a late-July Sunday when the upstairs unit quits at 4 p.m. and the family calls three companies before dinner. The one that answers first is the one most likely to get the job.

September through December. Hail does not disappear. September’s 55 reports in ten years are a reminder to keep storm capacity on standby. Heat can also run past the average last date, as 1951’s October 3 reading shows. For most trades this is the time to catch up on the jobs that were deferred in the rush and to plan for next spring.

The pattern behind all four stretches is the same. Demand in this region does not arrive evenly, and the days that matter most are often the days the office is most overwhelmed. Planning for that means deciding ahead of time who covers the phones after hours, how fast a missed call gets a reply and which jobs get booked first when the schedule is full.

That surge-week problem is the work Automation Results does for service companies in Dallas–Fort Worth. When your team is busy or the office is closed, every call gets answered: the caller gets a few questions about the job, where it is and how soon they need someone, then a booked slot in your schedule with the details attached. A missed call or website form gets a text reply within minutes, day or night. Anything outside your service area, job types or booking rules goes to your team with the details so a person can decide. Every inquiry is logged in the CRM you already use.

About this guide

The hail counts were tallied by Automation Results from NOAA’s public Storm Events files for 2016 through 2025, and the heat figures come from the National Weather Service office in Fort Worth. Both were accessed on October 30, 2026. Nothing here is a forecast. Past reports describe when hail and heat have tended to arrive, not when they will next year. The guide is reviewed every six months and updated when NOAA posts a new full year of Storm Events data.