Hail History

Hail history for Lyons, Colorado

NOAA hail reports in and within about 5 km (3 miles) of Lyons since 1982, with preliminary reports to November 3, 2026.

Readout · Lyons

Last hail
Jul 28, 2026
1.00 in, quarter size
Hail days, last 5 years
2
since Nov 3, 2021 · 2 reports
Largest ever
2.50 in
tennis ball · Jun 4, 2015

12 reports on 9 days since 1982 · #169 of 183 Colorado places

Hail map · Lyons

Lyons Longmont Niwot Gunbarrel Boulder Mead Erie 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
12 most recent reports with a location; Boulder County is shaded. Open street map

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What the record says about Lyons

The latest hail report in and around Lyons is from July 28, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on July 28, 2026.

Over the 20 years 2006–2025, Lyons logged 9 reports on 6 hail days, about 0.5 reports a year. That is 44% less than the median Colorado town on this site (0.8 a year) and ranks #169 of 183 Colorado cities and towns on this site for all-time reports. Lyons accounts for 3% of the 357 reports filed in Boulder County.

25% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median Colorado town on this site. The largest hail on record here is 2.50 in (tennis ball) on June 4, 2015 near Lyons.

Reports were down 88% in 2016–2025 (1) compared with 2006–2015 (8). The busiest year was 2015, with 3 reports on 1 day. Hail here peaks in June (67% of reports); 83% fall between April and June.

Reports a year 2006–2025 average

  • Lyons 0.5
  • Boulder County 10.4
  • Median Colorado town on this site 0.8

Hail days 2006–2025

  • Lyons 6
  • Boulder County 66
  • Median Colorado town on this site 11

Share 2 in or larger of sized reports

  • Lyons 25%
  • Boulder County 7%
  • Median Colorado town on this site 8%

Hail over time

0123 1982: 1 reports, largest 0.75 in 1990 1996: 1 reports, largest 0.75 in 2000 2007: 1 reports, largest 1.00 in 2009: 1 reports, largest 0.75 in 2010 2011: 1 reports, largest 1.00 in 2013: 2 reports, largest 1.75 in 2015: 3 reports, largest 2.50 in 2020 2022: 1 reports, largest 1.00 in 2026: 1 reports, largest 1.00 in
Reports per year, 1982–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
02468 Jan Feb Mar Apr May: 2 reports (17%) May June: 8 reports (67%) Jun July: 2 reports (17%) Jul Aug Sep Oct Nov Dec
All 12 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 1 1
2025 0
2024 0
2023 0
2022 1 1
2021 0
2020 0
2019 0
2018 0
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Jul 28, 2026 1 1.00 in —
Jun 16, 2022 1 1.00 in —

Largest hail on record

Largest hail reports in Lyons
Date Size Location County Time · source
Jun 4, 2015 2.50 intennis ball Lyons Boulder 19:30 local · NCEI
Jun 4, 2015 2.50 intennis ball Lyons Boulder 18:03 local · NCEI
Jun 4, 2015 2.00 inhen egg 1.38 N Lyons Boulder 18:13 local · NCEI
Jun 28, 2013 1.75 ingolf ball Lyons Boulder 18:45 local · NCEI
Jun 28, 2013 1.25 inhalf dollar Lyons Boulder 18:37 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Lyons
Date Size Location County Time · source
Jul 28, 2026 1.00 inquarter 0.69 N Lyons Boulder 13:04 local · NCEI
Jun 16, 2022 1.00 inquarter Lyons Boulder 20:46 local · NCEI
Jun 4, 2015 2.50 intennis ball Lyons Boulder 19:30 local · NCEI
Jun 4, 2015 2.00 inhen egg 1.38 N Lyons Boulder 18:13 local · NCEI
Jun 4, 2015 2.50 intennis ball Lyons Boulder 18:03 local · NCEI
Jun 28, 2013 1.75 ingolf ball Lyons Boulder 18:45 local · NCEI
Jun 28, 2013 1.25 inhalf dollar Lyons Boulder 18:37 local · NCEI
Jul 13, 2011 1.00 inquarter 3.18 NNE Lyons Boulder 18:17 local · NCEI
Jun 9, 2009 0.75 inpenny Lyons Boulder 16:10 local · NCEI
May 14, 2007 1.00 inquarter Lyons Boulder 16:27 local · NCEI
May 29, 1996 0.75 inpenny 1 NW Lyons Boulder 17:35 local · NCEI
Jun 30, 1982 0.75 inpenny — Boulder 14:15 local · NCEI

Hail history near Lyons

Questions about hail in Lyons

How often does it hail in Lyons, Colorado?

12 hail reports have been logged in and within about 5 km (3 miles) of Lyons since 1982. Over the 20 years 2006–2025 that averages 0.5 reports a year. That ranks #169 of 183 Colorado places by number of reports.

When is hail season in Lyons?

Most reports come in June, May, July. June alone accounts for 67% of all reports.

What is the largest hail recorded in Lyons?

2.50 in (tennis ball size) on June 4, 2015 near Lyons. 25% of reports here were 2 inches or larger.

When did it last hail in Lyons?

The most recent report in this data is from July 28, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Lyons had in the last five years?

2 separate days with hail reports since November 3, 2021, adding up to 2 reports. The most recent was July 28, 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.