Hail history for Knox County, Tennessee
Every NOAA hail report filed in Knox County since 1961, with preliminary National Weather Service reports to November 5, 2026.
Readout · Knox County
- Last hail
- Aug 20, 2026
- 0.75 in, penny size · preliminary
- Hail days, last 5 years
- 11
- since Nov 5, 2021 · 28 reports
- Largest ever
- 3.00 in
- teacup · May 21, 1998
170 reports on 105 days since 1961 · #5 of 96 Tennessee counties
Hail map · Knox County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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What the record says about Knox County
The latest hail report in Knox County is from August 20, 2026, 0.75 in (penny size). Since November 5, 2021 there have been 11 separate hail days; the biggest stones in that time were 1.75 in on September 4, 2025.
Over the 20 years 2006–2025, Knox County logged 93 reports on 49 hail days, about 4.7 reports a year. That is 2.8 times the median Tennessee county (1.6 a year) and ranks #5 of 96 Tennessee counties for all-time reports. Knox County holds 2% of all 7,198 hail reports in Tennessee.
5% of reports with a size were 2 inches (hen egg) or larger, against 4% for the median Tennessee county. The largest hail on record here is 3.00 in (teacup) on May 21, 1998 near Knoxville.
Reports were down 18% in 2016–2025 (42) compared with 2006–2015 (51). The busiest year was 1998, with 19 reports on 10 days. Hail here peaks in May (30% of reports); 70% fall between April and June.
Reports a year 2006–2025 average
- Knox County 4.7
- Median Tennessee county 1.6
Hail days 2006–2025
- Knox County 49
- Median Tennessee county 23
Share 2 in or larger of sized reports
- Knox County 5%
- Median Tennessee county 4%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | |||||||||||
| 2025 | 6 | 9 | 1 | 16 | |||||||||
| 2024 | 3 | 3 | |||||||||||
| 2023 | 4 | 2 | 1 | 1 | 8 | ||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 2 | 2 | |||||||||||
| 2017 | 1 | 2 | 2 | 5 |
Hail days since Nov 5, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 20, 2026 | 1 | 0.75 in | View |
| Oct 21, 2025 | 1 | 0.75 in | — |
| Sep 4, 2025 | 9 | 1.75 in | — |
| Apr 10, 2025 | 6 | 1.75 in | — |
| May 26, 2024 | 3 | 1.75 in | — |
| Aug 12, 2023 | 1 | 1.00 in | — |
| Jul 2, 2023 | 1 | 1.00 in | — |
| Jun 11, 2023 | 1 | 1.00 in | — |
| Jun 5, 2023 | 1 | 1.00 in | — |
| May 16, 2023 | 3 | 1.00 in | — |
| May 7, 2023 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| May 21, 1998 | 3.00 inteacup | Knoxville | — | 17:10 local · NCEI |
| Apr 27, 2011 | 2.75 inbaseball | 2 SE Knoxville | $30K | 19:15 local · NCEI |
| May 21, 1998 | 2.75 inbaseball | Knoxville | — | 17:40 local · NCEI |
| May 10, 1995 | 2.50 intennis ball | Harbison | $2 | 13:50 local · NCEI |
| Jun 10, 1963 | 2.50 intennis ball | — | — | 15:00 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 52 31%
- 1–2 in 109 64%
- 2 in + 9 5%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Aug 20, 2026 | 0.75 inpenny | 2 NW Farragut | 02:05 UTC · NWS prelim. |
| Oct 21, 2025 | 0.75 inpenny | 1.32 ENE Neubert | 13:14 local · NCEI |
| Sep 4, 2025 | 1.00 inquarter | 0.89 SW Cedar Bluff | 13:57 local · NCEI |
| Sep 4, 2025 | 0.75 inpenny | 0.56 W Lyons View | 13:26 local · NCEI |
| Sep 4, 2025 | 0.75 inpenny | 1.32 ENE Neubert | 13:18 local · NCEI |
| Sep 4, 2025 | 0.75 inpenny | 0.89 SW Cedar Bluff | 13:17 local · NCEI |
| Sep 4, 2025 | 1.00 inquarter | 1.32 WNW Kingsley | 13:07 local · NCEI |
| Sep 4, 2025 | 1.50 inping pong ball | 1.12 E Beaver Ridge | 12:35 local · NCEI |
| Sep 4, 2025 | 1.75 ingolf ball | 0.56 E Beaver Ridge | 12:35 local · NCEI |
| Sep 4, 2025 | 1.00 inquarter | 1.68 W Byington | 12:30 local · NCEI |
| Sep 4, 2025 | 1.25 inhalf dollar | 0.56 E Branch Hill | 12:30 local · NCEI |
| Apr 10, 2025 | 1.50 inping pong ball | 1.32 WSW Shooks | 17:05 local · NCEI |
Cities and towns in Knox County
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Karns | 5 | 4 | Sep 4, 2025 |
| Mascot | 5 | 5 | May 26, 2024 |
| Blaine | 3 | 3 | May 16, 2023 |
| Plainview | 1 | 1 | Jul 3, 2001 |
Questions about hail in Knox County
How often does it hail in Knox County, Tennessee?
170 hail reports have been logged in Knox County since 1961. Over the 20 years 2006–2025 that averages 4.7 reports a year. That ranks #5 of 96 Tennessee counties by number of reports.
When is hail season in Knox County?
Most reports come in May, April, June. May alone accounts for 30% of all reports.
What is the largest hail recorded in Knox County?
3.00 in (teacup size) on May 21, 1998 near Knoxville. 5% of reports here were 2 inches or larger.
When did it last hail in Knox County?
The most recent report in this data is from August 20, 2026 (0.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 5, 2026.
How many hail storms has Knox County had in the last five years?
11 separate days with hail reports since November 5, 2021, adding up to 28 reports. The most recent was August 20, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.