Hail History

Hail history for Niwot, Colorado

NOAA hail reports in and within about 5 km (3 miles) of Niwot since 1983, with preliminary reports to November 3, 2026.

Readout · Niwot

Last hail
May 30, 2024
1.00 in, quarter size
Hail days, last 5 years
3
since Nov 3, 2021 · 4 reports
Largest ever
1.50 in
ping pong ball · Jun 19, 2018

11 reports on 8 days since 1983 · #172 of 183 Colorado places

Hail map · Niwot

Niwot Gunbarrel Longmont Boulder Erie Lafayette Louisville Lyons 5 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
11 most recent reports with a location; Boulder County is shaded. Open street map

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What the record says about Niwot

The latest hail report in and around Niwot is from May 30, 2024, 1.00 in (quarter size). Since November 3, 2021 there have been 3 separate hail days; the biggest stones in that time were 1.00 in on May 30, 2024.

Over the 20 years 2006–2025, Niwot logged 8 reports on 5 hail days, about 0.4 reports a year. That is about half the median Colorado town on this site (0.8 a year) and ranks #172 of 183 Colorado cities and towns on this site for all-time reports. Niwot accounts for 3% of the 357 reports filed in Boulder County.

0% 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 1.50 in (ping pong ball) on June 19, 2018 near 2.22 WNW Niwot.

Reports were up 600% in 2016–2025 (7) compared with 2006–2015 (1). The busiest year was 2018, with 3 reports on 1 day. Hail here peaks in June (36% of reports); 73% fall between April and June.

Reports a year 2006–2025 average

  • Niwot 0.4
  • Boulder County 10.4
  • Median Colorado town on this site 0.8

Hail days 2006–2025

  • Niwot 5
  • Boulder County 66
  • Median Colorado town on this site 11

Share 2 in or larger of sized reports

  • Niwot 0%
  • Boulder County 7%
  • Median Colorado town on this site 8%

Hail over time

0123 1983: 1 reports, largest 0.75 in 1989: 1 reports, largest 0.75 in 1990 1991: 1 reports, largest 0.75 in 2000 2007: 1 reports, largest 0.75 in 2010 2018: 3 reports, largest 1.50 in 2020 2022: 1 reports, largest 0.75 in 2023: 1 reports, largest 1.00 in 2024: 2 reports, largest 1.00 in
Reports per year, 1983–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
01234 Jan Feb Mar April: 1 reports (9%) Apr May: 3 reports (27%) May June: 4 reports (36%) Jun July: 1 reports (9%) Jul August: 2 reports (18%) Aug Sep Oct Nov Dec
All 11 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 0
2024 2 2
2023 1 1
2022 1 1
2021 0
2020 0
2019 0
2018 3 3
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
May 30, 2024 2 1.00 in —
May 9, 2023 1 1.00 in —
Jul 26, 2022 1 0.75 in —

Largest hail on record

Largest hail reports in Niwot
Date Size Location County Time · source
Jun 19, 2018 1.50 inping pong ball 2.22 WNW Niwot Boulder 11:50 local · NCEI
May 30, 2024 1.00 inquarter Niwot Boulder 20:00 local · NCEI
May 30, 2024 1.00 inquarter 0.53 W Niwot Boulder 19:58 local · NCEI
May 9, 2023 1.00 inquarter Niwot Boulder 21:38 local · NCEI
Jun 19, 2018 1.00 inquarter 2.22 WNW Niwot Boulder 11:40 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Niwot
Date Size Location County Time · source
May 30, 2024 1.00 inquarter Niwot Boulder 20:00 local · NCEI
May 30, 2024 1.00 inquarter 0.53 W Niwot Boulder 19:58 local · NCEI
May 9, 2023 1.00 inquarter Niwot Boulder 21:38 local · NCEI
Jul 26, 2022 0.75 inpenny Niwot Boulder 14:52 local · NCEI
Jun 19, 2018 1.50 inping pong ball 2.22 WNW Niwot Boulder 11:50 local · NCEI
Jun 19, 2018 1.00 inquarter 2.22 WNW Niwot Boulder 11:40 local · NCEI
Jun 19, 2018 1.00 inquarter 1.26 WNW Niwot Boulder 11:18 local · NCEI
Apr 23, 2007 0.75 inpenny 1.26 ENE Niwot Boulder 16:19 local · NCEI
Aug 6, 1991 0.75 inpenny — Boulder 17:05 local · NCEI
Jun 3, 1989 0.75 inpenny — Boulder 16:56 local · NCEI
Aug 13, 1983 0.75 inpenny — Boulder 14:45 local · NCEI

Hail history near Niwot

Questions about hail in Niwot

How often does it hail in Niwot, Colorado?

11 hail reports have been logged in and within about 5 km (3 miles) of Niwot since 1983. Over the 20 years 2006–2025 that averages 0.4 reports a year. That ranks #172 of 183 Colorado places by number of reports.

When is hail season in Niwot?

Most reports come in June, May, August. June alone accounts for 36% of all reports.

What is the largest hail recorded in Niwot?

1.50 in (ping pong ball size) on June 19, 2018 near 2.22 WNW Niwot. 0% of reports here were 2 inches or larger.

When did it last hail in Niwot?

The most recent report in this data is from May 30, 2024 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

3 separate days with hail reports since November 3, 2021, adding up to 4 reports. The most recent was May 30, 2024.

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.