Tornado History Map

Boulder County, Colorado tornado history

12 tornadoes recorded in or across Boulder County from 1953 to 2015, coloured by rating on the map.

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Years1950 to 2025
Rating (F or EF scale)

Shows tornadoes that started in, or crossed, the chosen state. To see how many have passed near you, search a town or ZIP code, or tap the map.

Key
  • F0 / EF0 Light damage
  • F1 / EF1 Moderate damage
  • F2 / EF2 Considerable damage
  • F3 / EF3 Severe damage
  • F4 / EF4 Devastating damage
  • F5 / EF5 Incredible damage
  • Unknown Not rated (2007 onwards)

How to read the lines. Each line is one tornado, drawn from where it started to where it ended, coloured and sized by its rating. A dot means the record has no end point. Tap a line for its details, or tap anywhere else to see how many tornadoes have passed nearby. Weaker tornadoes appear as you zoom in. Ratings use the Fujita (F) scale before 1 February 2007 and the Enhanced Fujita (EF) scale from then on.

Tornadoes in Boulder County

The Storm Prediction Center records 12 tornadoes whose paths touched Boulder County, Colorado between 1953 and 2015. None of them is recorded as having killed anyone. The busiest month is June, with 6 tornadoes. The strongest was an EF3 on 4 June 2015. The most recent was on 4 June 2015.

  • 12tornadoes
  • 0deaths
  • 0injuries
  • 165per 10,000 sq mi of land

A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.

How strong were the tornadoes in Boulder County?

RatingTornadoesShare
F0 / EF0325%
F1 / EF1650%
F2 / EF2217%
F3 / EF318%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Boulder County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 4 in 1990s.1950s21970s21980s31990s42010s1

The 2010s only run to 2015, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s2
1970s2
1980s3
1990s4
2010s1
Tornadoes by month
Bar chart of tornadoes by period. The most is 6 in Jun.Jan0Feb0Mar0Apr1May2Jun6Jul1Aug0Sep1Oct1Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr1
May2
Jun6
Jul1
Aug0
Sep1
Oct1
Nov0
Dec0

Records for Boulder County

  • Strongest and Longest path and Most recent: Colorado tornado4 June 2015, EF3, 6.7 miles long

Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.

More in Colorado

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