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COVID-19 Data

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Boulder County COVID-19 Data

Updated at 3 p.m. on Nov. 30

  • The COVID-19 Case Data Summary will be updated Monday – Friday by 4 p.m.
  • The COVID-19 Data Graphs are updated on Mondays or the previous or following day if that day falls on a holiday.
  • Graphs will be adjusted every three months to ensure legibility.
  • Hospitalization data can be tracked through the Hospital Resource Summary located below, including available hospital resources and the number of people hospitalized and discharged.
  • Data on 7-day PCR positivity will be updated weekly in the testing section below.

Boulder County Public Health is notified of Boulder County residents who test positive for COVID-19. The information below only represents individuals who have tested positive or are considered probable. Students living in Boulder for school are considered residents.

COVID-19 Case Data Summary

Status Number of Individuals in Boulder County
Tested Positive or considered Probable for COVID-19 (at close of previous day) 34,915
Deceased with COVID-19, to date 310
New cases per 100,000 people in the past 7 days** 176.9

*Some data may be missing due to ongoing disease investigations and reporting delays.

**Data provided by the CDC COVID-19 Data Tracker

COVID-19 Data Graphs


The following information includes data about COVID-19 PCR (diagnostic) testing among Boulder County residents. Data presented includes 3 days prior to receiving the test result due to the average lag between the time a test is conducted and when the results are reported to the Colorado Department of Public Health and Environment (CDPHE).

BCPH calculates the percent positive is calculated as number of positive tests/number of total tests using data from the Electronic Laboratory Reporting (ELR) system, which does not include all labs testing for COVID-19 and does not include home test kits or saliva-based testing. All other data on this webpage represent results from all labs.

*The data represented in this graph only shows tests reported using the Electronic Laboratory Reporting system, which has included CU since Sept. 21, 2020. It does not include all labs testing for COVID-19. All other graphs on this webpage represent results from all labs.


This graph presents case counts by day rather than growth rates in total cases over time to increase the interpretation and actionability of the data. All graphs are updated on Monday afternoons.

Town/City of Residence

Please note: the previous graphs used a street address to determine the municipality. The current method uses actual boundaries for cities as well as for unincorporated Boulder County. The new method is more accurate, though the actual case count may differ slightly from the previous graphs.

To protect patient privacy, municipalities with fewer than three people with confirmed or probable COVID-19 are not included, in alignment with the Colorado Department of Public Health and Environment.

*Data for some municipalities may underestimate the true prevalence since residents list their address as a PO Box instead of a physical address. This means their residence is unable to be geocoded to determine whether they reside in the municipality.

Note: Due to rate instability, rates are not calculated for municipalities with fewer than five people positive or probable for COVID-19.


At the heart of disparities is systematic racism, which research illustrates creates institutional barriers to things like preventive medical care, healthy food, safe and stable housing, quality education, reliable transportation and clean air impact health outcomes.

Long-Term Care Facilities in Boulder County

Older individuals, those with underlying health conditions, and anyone who lives in a congregate setting, such as a long-term care facility is more at risk for contracting COVID-19, and at greater risk for severe illness and death from the virus. For detailed information about outbreaks in Boulder County long-term care facilities, visit the CDPHE outbreak data webpage.

COVID-19 Illness Data Summary

The information on this page is a summary of information about Boulder County residents who have tested positive for COVID-19 or are likely positive (Probable*) for COVID-19. The information is compiled and analyzed by Boulder County Public Health from disease investigations conducted with those who have tested positive for COVID-19 in the county combined with reports from the Colorado Department of Public Health and Environment, local hospitals, and the Boulder County Coroner.

Please note that details provided on the Colorado Department of Public Health and Environment website may not match this information due to delays in reporting. This information is subject to change at any time as disease investigations are ongoing. We have removed the recovery and transmission graphs due to incomplete data as a result of limited resources.

Reporting Methodology

Boulder County Public Health and CU Boulder are working to align our COVID data reporting methodology as much as possible. Review the reporting diagram for more information about how data is reported and shared.

Data Quality

The Boulder County Public Health Epidemiology and Surveillance Teams currently use our own data system in addition to the state data system to ensure we are reporting on the most up-to-date information. Each week, the Surveillance Team compares the state data to the Boulder County data to check if case investigations or interviews found that someone who was categorized as a Boulder County resident actually lives in another Colorado county. If this occurs, that person’s record is deleted from the Boulder County data system which is reflected in the data immediately. The team also looks for duplicate records and merges the records if duplicates are identified. Lastly, a check is performed to ensure that we are capturing all deaths reported to the state among people with COVID-19. Although we receive death information directly from the coroner and patient medical records, there have been instances where a death was reported to the state only and we discovered it through our quality assurance process.

About this Information

Individuals (cases) are counted on the day in which they are reported to the state data system, regardless of the day the investigation was completed. There was one day – April 23, 2020 – in which a backlog of test results was received through this system.

Hospitalization information is determined during the first disease interview or through medical record review. Quality assurance processes may identify hospitalization after an interview occurred if medical record information can be located. We do not have access to information about who is no longer hospitalized with COVID-19.

COVID-19 death data represents the total number of deaths reported among people who have tested positive or considered probable for COVID-19, even when COVID-19 may not have been the cause of death listed on the death certificate. This information is required by the CDC and is crucial for public health surveillance, as it provides more information about disease transmission and can help identify risk factors among all deaths across populations.

Deaths are identified through medical record review, notification by the Boulder County coroner, notification by a long-term care facility or other healthcare provider, and through information from the Colorado Department of Public Health and Environment including death certificates.

Boulder County Public Health reports deaths of individuals with COVID-19 who are Boulder County residents. The Boulder County Coroner reports all deaths that occur within the county, regardless of county of residence.

As with all reportable diseases, Boulder County Public Health staff contact each Boulder County resident who tests positive for COVID-19 to identify any person who may have come in close contact with the ill person. Each close contact who is identified as at-risk of contracting the disease is then contacted and provided guidance for next steps, including isolation, quarantine, and/or testing, if needed.

These practices are vital to identifying the presence of disease and the response actions needed to protect residents.

It may be deemed that a person is “Probable” (e.g. clinically diagnosed for COVID-19 or epidemiologically linked) if they came in close contact with a person who has tested positive for COVID-19 and was determined to be high risk during the disease investigation, AND they became symptomatic in the two weeks after contact with the ill person or the two weeks before, while they were infectious. Probable cases are determined using the CDC and Council of State and Territorial Epidemiologists case definition which includes both epidemiological and clinical criteria.

Testing data includes every individual for whom we have received a positive result for a diagnostic (PCR) test. Every individual is only counted once, even if they have multiple positive tests.

Individuals who received a positive antibody test are NOT considered confirmed cases. These individuals could be considered a probable case if they also meet clinical or epidemiological criteria. This represents less than 1% of Boulder County cases.

Testing data includes all tests among people who report a Boulder County residence regardless of where testing was received. Not all labs historically reported negative lab results but most labs now report both positive and negative test results.

The percent positive is calculated by dividing all positive PCR tests among Boulder County residents by all PCR tests performed among Boulder County residents since COVID-19 testing began. The 5-day average is the proportion of all tests that were positive over the last 5 days with complete data (3 days prior to the current day).

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Boulder County Public Health

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