COVID-19 Vaccines

Currently available COVID-19 vaccines include:
  • Pfizer for anyone age 6 months or older
  • Moderna for anyone age 6 months or older
  • Novavax for anyone age 12 years or older
  • Johnson & Johnson for anyone age 18 years or older*

*The Johnson & Johnson vaccine is only authorized for some people

Quick Links 

CDPHE: COVID-19 Vaccine

CDC: Vaccines for COVID-19

CDPHE: COVID-19 Vaccine Dose Calculator

The Weld County Health Department Clinic has the Pfizer and Moderna vaccines available. If you have questions or would like to schedule an appointment at the Health Department Clinic, please call (970) 304-6420. To find other COVID-19 vaccine providers near you, click on the Where to Get a COVID-19 Vaccine tile below.  

The FDA authorized and the CDC approved in September 2022 updated (bivalent) versions of the Pfizer and Moderna COVID-19 vaccines. The updated vaccines offer protection from the original COVID-19 virus and the omicron variant that is currently circulating. The bivalent Moderna COVID-19 vaccine is authorized for administration at least 2 months following completion of primary or booster vaccination for anyone aged 6 years and older. The bivalent Pfizer-BioNTech COVID-19 vaccine is authorized for administration at least 2 months following completion of primary or booster vaccination anyone aged 5 years and older. Learn more about the updated omicron doses from CDPHE.

Standard COVID-19 Vaccine Dosing Schedules

COVID-19 vaccine recommendations are based on your age, the vaccine you first received, and the time since your last dose. Children get a smaller dose of COVID-19 vaccine than teens and adults based on their age group. Updated COVID-19 boosters can both help restore protection that has decreased since previous vaccination, and provide broader protection against newer variants. The updated, or bivalent boosters, target the most recent Omicron subvariants, BA.4 and BA.5, that are more contagious and more resistant than earlier strains of Omicron.

Pfizer Vaccine

All Coloradans ages 6 months and older are eligible to receive a Pfizer COVID-19 vaccine. The Pfizer vaccine is available at the Weld County Health Department Clinic. The dosing schedules are as follows: 

  • 6 months to 4 years: 
     Primary series Booster series
    1st dose  2nd dose 3-8 weeks later  3rd dose 8 weeks later  No booster
     Up to date: 2 weeks after a 3rd dose, since a booster is not recommended for this age group at this time
     
  • 5-11 years: 
     Primary series Booster series
    1st dose  2nd dose 3-8 weeks later 3rd dose 2 months later (updated Pfizer bivalent booster for children)
     Up to date: Immediately after 3rd dose

  • 12-17 years: 
    Primary series 
    Booster series 
    1st dose  2nd dose 3-8 weeks later 3rd dose 2 months later (updated Pfizer bivalent booster)
    Up to date: Immediately after the most recent booster
  • 18 years and older: 
    Primary series  Booster series
    1st dose  2nd dose 3-8 weeks later 3rd dose 2 months later (updated Pfizer or Moderna bivalent booster)
    Up to date: Immediately after the most recent booster 

Moderna Vaccine

All Coloradans ages 6 months and older also are eligible to receive the Moderna COVID-19 vaccine. The Moderna vaccine is available at the Weld County Health Department Clinic. The dosing schedules are as follows:

  • 6 months to 5 years: 
    Primary series  Booster series
    1st dose  2nd dose 4-8 weeks later No booster 
    Up to date: 2 weeks after 2nd dose, since a booster is not recommended for this age group at this time

  • 6-17 years: 
    Primary series  Booster series 
    1st dose  2nd dose 4-8 weeks later 3rd dose 2 months later (updated Moderna bivalent booster for children and adolescents) 
    Up to date: Immediately after the most recent booster
  • 18 years and older: 
    Primary series  Booster series
    1st dose  2nd dose 4-8 weeks later 3rd dose 2 months later (updated Pfizer or Moderna bivalent booster) 
    Up to date: Immediately after the most recent booster 

Janssen (Johnson & Johnson) Vaccine

All Coloradans ages 18 and older are eligible to receive the  Janssen (Johnson & Johnson) COVID-19 vaccine. As of May 5, 2022, the Johnson & Johnson vaccine is only authorized for some people: individuals 18 years of age and older for whom other authorized or approved COVID-19 vaccines are not accessible or clinically appropriate, and to individuals 18 years of age and older who elect to receive the Johnson & Johnson COVID-19 vaccine because they would otherwise not receive a COVID-19 vaccine. The Johnson & Johnson vaccine is no longer available at the Weld County Health Department Clinic. The dosing schedule is as follows: 

  • 18 years and older: 
    Primary series  Booster series
    1st dose 2nd dose 2 months later (updated Pfizer or Moderna bivalent booster)
    Up to date: Immediately after the most recent booster 

Novavax Vaccine

All Coloradans age 12 and older are eligible to receive the Novavax COVID-19 vaccine. The Novavax vaccine is not available at the Weld County Health Department Clinic. The dosing schedule is as follows:

  • 12-17 years: 
    Primary series  Booster series 
    1st dose  2nd dose 3-8 weeks later  3rd dose 2 months later (updated Pfizer or Moderna bivalent booster) 
    Up to date: Immediately after the most recent booster 

  • 18 years and older: 
    Primary series  Booster series 
    1st dose  2nd dose 3-8 weeks later 3rd dose 2 months later (updated Pfizer or Moderna bivalent booster) 
    Up to date: Immediately after the most recent booster 

For more details about vaccination schedules, go to the CDC's Stay Up to Date with COVID-19 Vaccines Including Boosters webpage.

COVID-19 Vaccine Dosing Schedules for People who are Immunocompromised

If you have a moderately to severely weakened immune system, you are at an increased risk of severe COVID-19 illness and death. Additionally, your immune response to COVID-19 vaccination may not be as strong as in people who are not immunocompromised. For those reasons, additional doses are recommended. See the recommended dosing schedules for the available vaccines below. 

Pfizer Vaccine

All Coloradans ages 6 months and older are eligible to receive a Pfizer COVID-19 vaccine. The Pfizer vaccine is available at the Weld County Health Department Clinic. The dosing schedules are as follows: 

  • 6 months to 4 years: 
    Primary series  Booster series
    1st dose 2nd dose 3 weeks later 3rd dose 8 weeks later No booster
    Up to date: 2 weeks after 3rd primary dose, since a booster is not recommended for this age group at this time 

  • 5-11 years: 
    Primary series  Booster series
    1st dose 2nd dose 3 weeks later 3rd dose 8 weeks later 4th dose 3 months later (updated Pfizer bivalent booster for children)
    Up to date: Immediately after the most recent booster

  • 12 years and older: 
    Primary series Booster series
    1st dose 2nd dose 3 weeks later 3rd dose 4 weeks later 4th dose 2 months later (updated Pfizer bivalent booster)
    Up to date: Immediately after the most recent booster

Moderna Vaccine

All Coloradans ages 6 months and older also are eligible to receive the Moderna COVID-19 vaccine. The Moderna vaccine is available at the Weld County Health Department Clinic. The dosing schedules are as follows:

  • 6 months to 5 years: 
    Primary series 
    Booster series 
    1st dose 2nd dose 4 weeks later 3rd dose 4 weeks later No booster 
    Up to date: 2 weeks after 3rd primary dose, since boosters are not recommended for this age group who have completed the Moderna primary series
  • 6-17 years: 
    Primary series Booster series
    1st dose 2nd dose 4 weeks later 3rd dose 4 weeks later 4th dose 2 months later (updated Moderna bivalent booster for children and adolescents)
    Up to date: Immediately after the most recent booster 

  • 18 years and older: 
    Primary series  Booster series
    1st dose  2nd dose 4 weeks later 3rd dose 4 weeks later 4th dose 2 months later (updated Pfizer or Moderna bivalent booster)
    Up to date: Immediately after the most recent booster 

Janssen (Johnson & Johnson) Vaccine

All Coloradans ages 18 and older are eligible to receive the  Janssen (Johnson & Johnson) COVID-19 vaccine. As of May 5, 2022, the Johnson & Johnson vaccine is only authorized for some people: individuals 18 years of age and older for whom other authorized or approved COVID-19 vaccines are not accessible or clinically appropriate, and to individuals 18 years of age and older who elect to receive the Johnson & Johnson COVID-19 vaccine because they would otherwise not receive a COVID-19 vaccine. The Johnson & Johnson vaccine is no longer available at the Weld County Health Department Clinic. The dosing schedule is as follows: 

  • 18 years and older: 
    Primary series  Booster series
    1st dose 2nd dose 4 weeks later (Pfizer or Moderna)  3rd dose 2 months later (updated Pfizer or Moderna bivalent booster)
    Up to date: Immediately after the most recent booster 

Novavax Vaccine

All Coloradans age 12 and older are eligible to receive the Novavax COVID-19 vaccine. The Novavax vaccine is not available at the Weld County Health Department Clinic. The dosing schedule is as follows:

  • 12-17 years: 
    Primary series  Booster series 
    1st dose  2nd dose 3 weeks later  3rd dose 2 months later (updated Pfizer or Moderna bivalent booster) 
    Up to date: Immediately after the most recent booster 

  • 18 years and older: 
    Primary series  Booster series 
    1st dose  2nd dose 3 weeks later 3rd dose 2 months later (updated Pfizer or Moderna bivalent booster) 
    Up to date: Immediately after the most recent booster 

For more details about vaccination schedules for those who are immunocompromised, go to the CDC's COVID-19 Vaccines for People Who Are Moderately or Severely Immunocompromised webpage.