Register for COVID-19 Vaccine

The new bivalent booster is now available to those ages 12 and older. It includes components of the original virus strain and the Omicron variant. The original monovalent booster continues to be available to those ages 5 to 11. It includes only components of the original virus strain.

Schedule your Moderna or Pfizer bivalent COVID-19 booster dose via vacstrac.hctx.net or by calling 832-927-8787. If you need help determining the proper timeline for when you need your COVID-19 booster dose, consult your primary care provider or visit the CDC's booster scheduling tool. 
As of September 20th, HCPH is no longer providing Johnson & Johnson COVID-19 vaccinations. Visit vacstrac.hctx.net to schedule your COVID-19 vaccine or booster dose today. You can also visit our COVID-19 vaccine local providers page for additional opportunities. 


Register for COVID-19 Vaccine


Harris County Public Health's COVID-19 vaccination sites serve walk-ups without appointments. However, appointments are encouraged for quicker service.


Provider Name
Public Phone Number
Public Registration or Website
Harris County Public Health
832-927-8787
Houston Health Department
832-393-4220


*This registration app is not compatible with Internet Explorer. Please use a different browser. When you have registered, please allow 15 - 30 minutes for the confirmation email and text message to arrive.


Vaccine Availability and Eligibility 

Following state guidance, Harris County has opened vaccine eligibility to all residents ages 6 months and older. Per the FDA's emergency use authorizations:

  • Moderna COVID-19 vaccine for ages 6 months and older
  • Pfizer COVID-19 vaccine for ages 6 months and older
  • Novavax COVID-19 vaccine, adjuvanted for ages 12 years and older



How Do I Register?

HCPH is now offering COVID-19 vaccine appointments on demand.

  • Those who register online here (Register Now) can schedule your appointment instantly. You will be able to choose between available days and times, locations, and vaccines.
  • Those who register by phone (832-927-8787) will be able to schedule an appointment date and time when they call.

HCPH Vaccine Registration Guidance:
Helping Older Adults Register for HCPH's COVID Vaccine
HCPH COVID-19 Vaccinations for Ages 5 - 17
Local 5 - 17 Year Old Vaccine Provider List
Vaccination Drive-Thru Information
What to Expect At A Vaccine Distribution Unit (VDU)




Step 1: What You Need to Know

In most situations, Pfizer or Moderna COVID-19 vaccines are preferred over the Johnson & Johnson COVID-19 vaccine for primary and booster vaccination due to the risk of rare, but serious adverse events.

  • The Moderna vaccine can be provided to individuals 6 months older. Moderna is administered as a 2-dose primary series for most people or a 3-dose primary series for people who are moderately or severely immunocompromised.
  • The Pfizer vaccine can be provided to individuals 6 months or older. Pfizer is administered as a 2-dose primary series for most people or a 3-dose primary series for people who are moderately or severely immunocompromised. For children 6 months through 4 years old the Pfizer vaccine is administered as a 3-dose primary series.
  • All vaccines through HCPH are free of charge.
Step 2: Making an Appointment with HCPH
  • Click on the Register Now link to go to HCPH's COVID-19 vaccine app. 
  • Follow the instructions on the app to register for the vaccine. 
  • Once your appointment is scheduled, you will receive a confirmation including QR code. You must bring your QR code with you to the scheduled appointment.
Step 3: Receiving Your Vaccine
  • When arriving at an HCPH vaccination site, make sure to bring your QR code if you have a scheduled appointment. (Print out or on your phone)
  • If you did not schedule an appointment, please follow the signage and work with HCPH site staff to help you register. 
  • Be prepared to wait 15-30 minutes after your vaccination to ensure you do not experience any adverse effects. HCPH has trained site staff to assist residents who feel they need medical care. 

If you do not have transportation for your vaccination appointment, please contact the HCPH Vaccine Hotline at 832-927-8787.

Step 4: Scheduling Your Second Dose

Individuals can sign up and schedule instantly. Residents are encouraged to plan for their 2nd dose 3 to 8 weeks after their 1st dose. Learn more here.

Upon completion of your scheduled first dose, you will receive a notification through text and/or email to schedule your 2nd dose closer to the date of your 2nd appointment. If there is no appointment availability, please continue to check the link daily for open appointments until you can sign up.

Pfizer and Moderna COVID-19 Vaccination Schedule
The recommended interval between the 1st and 2nd dose:

For people ages 6 months to 64 years old, and especially males ages 12 through 39 years old:

  • 8-week interval for Pfizer and Moderna
    • A longer time between the 1st and 2nd doses may increase how much protection the vaccines offer, and further minimize the rare risk of heart problems, including myocarditis and pericarditis

For people ages 65 and older or 6 months older who are moderately or severely immunocompromised:

  • 3-week interval for Pfizer
  • 4-week interval for Moderna
Step 5: Schedule Your Booster Dose

A booster dose is given when the immune response to an initial vaccine series has likely to have decreased over time.

1st Booster Dose:
All eligible people ages 5 years and older should receive the 1st booster dose of any FDA-authorized or approved COVID-19 vaccine. Currently, a booster is not recommended for any children or teens between the ages of 6 months to 17 years old who have completed the Moderna 2-dose primary series. The interval for the 1st booster dose should follow the interval recommended for the primary series you received. See recommendations below of when you should receive your 1st booster dose:

Pfizer or Moderna:

  • 5 months after completing a 2-dose primary series of Pfizer or Moderna
  • 3 months after completing a 3-dose primary series of Pfizer or Moderna for people who are moderately or severely immunocompromised

2nd Booster Dose: 

Residents age 50 and older can get the 2nd COVID-19 booster dose. There are residents in certain groups or situations who can get a 2nd COVID-19 booster according to recent CDC guidance, but HCPH recommends you work with your healthcare provider to help make the best decision for your health situation.

For more information about COVID-19 Vaccine  2nd Booster Doses and to see if you’re eligible, please visit the CDC website.

Please note the steps outlined above are for Harris County Public Health vaccination sites only. Steps for other providers may differ.




About COVID-19 Vaccines

Several COVID-19 vaccines have been authorized for emergency use by the U.S. Food and Drug Administration (FDA). Learn more below. 

  • Pfizer-BioNTech COVID-19 vaccine: This vaccine is approved by the FDA and authorized for emergency use in individuals 6 months and older. Pfizer vaccination is administered as a 2-dose primary series for most people or a 3-dose primary series for people who are moderately or severely immunocompromised. In children ages, 6 months through 4 years old the Pfizer vaccine is administered as a 3-dose primary series. Clinical trial data show that the vaccine is 95 percent effective in preventing mild, moderate, or severe COVID-19. Individuals will not be considered fully protected until two weeks after the final dose in the primary series.

  • Moderna COVID-19 vaccine: This mRNA vaccine is approved by the FDA and authorized for emergency use in individuals 6 months and older. Moderna vaccination is administered as a 2-dose primary series for most people or a 3-dose primary series for people who are moderately or severely immunocompromised. Clinical trial data show the vaccine is about 94 percent effective in preventing mild, moderate, or severe COVID-19. Individuals will not be considered fully protected until two weeks after the final dose in the primary series.  

  • Johnson & Johnson COVID-19 vaccine (Not Available Through HCPH): This vaccine is a viral vector vaccine authorized for emergency use in individuals 18 years of age and older for whom other FDA-authorized or approved COVID-19 vaccines are not accessible or clinically appropriate, and individuals 18 years of age and older who elect to receive the Janssen COVID-19 Vaccine because they would otherwise not receive a COVID-19 vaccine. This vaccine can cause blood clots with low levels of platelets (blood cells that help your body stop bleeding), which may be fatal. This vaccine can be administered as a single dose primary vaccination, a single booster dose after completing a primary vaccination with the Johnson & Johnson COVID-19 Vaccine, or a single booster dose after completing primary vaccination with a different authorized or approved COVID-19 vaccine. Clinical trial data show that this vaccine is about 72 percent effective in preventing mild and moderate COVID-19 infections and 85 percent effective at preventing severe disease. Clinical trial data show that the vaccine was about 67% effective in preventing mild, moderate, or severe COVID-19. Individuals will not be considered fully protected until two weeks after the final dose in the primary series. 

  • Novavax COVID-19 vaccine, Adjuvanted: This vaccine is a protein-based vaccine authorized for emergency use in  individuals 12 years of age and older as a 2-dose primary series given three weeks apart. This vaccine contains the SARS-CoV-2 spike protein and an adjuvant. Adjuvants are incorporated into some vaccines to enhance the immune response of the vaccinated individual. Novavax is not authorized for use as a booster dose at this time. Clinical trial data show that the vaccine was about 90 percent effective in preventing mild, moderate, or severe COVID-19. Individuals will not be considered fully protected until  two weeks after the final dose in the primary series.



Registration FAQ


How do I register without access to Internet or a computer?

If you or a loved one do not have access to the Internet or a computer, please use the phone number listed above to schedule your appointment or visit one of HCPH's vaccines sites for walk-up registration.

Can I receive my 2nd dose at HCPH if I got my 1st dose from another provider?

If you received your first dose of COVID-19 vaccine at another provider, you can still receive your second, additional, or booster dose at a vaccine site operated by Harris County Public Health (HCPH). To schedule your appointment, please call the HCPH Vaccine Hotline at 832-927-8787 or register online.

What do I do about my appointment if I do not have access to a personal vehicle?

Residents who do not have access to a personal vehicle may still receive vaccines at HCPH vaccination sites. Please call the health department (i.e., Harris County Public Health, Houston Health Department) you registered with for alternative arrangements. For appointments with Harris County Public Health, call the HCPH Vaccine Hotline at 832-927-8787.

What COVID-19 vaccine should I get?

All of the vaccines being offered by Harris County are safe and effective at protecting people from getting seriously ill, being hospitalized, and even dying—especially when boosted. You can choose which COVID-19 vaccine to get depending on your age and preference. 

For adults ages 18 years and older, the mRNA COVID-19 vaccines (Pfizer-BioNTech or Moderna) and protein-based COVID-19 vaccine (Novavax) are preferred over Johnson & Johnson’s Janssen COVID-19 vaccine. The primary difference between these vaccines is that the Pfizer, Moderna, and Novavax vaccines require two shots whereas the Johnson & Johnson vaccine can be administered in one shot. Maximize protection and get all recommended vaccine doses and boosters as soon as possible.

Currently, the Pfizer & Moderna COVID-19 vaccines are the only COVID-19 vaccine available to children 6 months and older. 

I lost my vaccine card. Can HCPH help me get a replacement?
Yes! If you lost your vaccine card and need a replacement one, call 832-927-8787. Our call center will help find your vaccination records and provide residents with a replacement card.



Other Providers

If you were unable to schedule vaccination with Harris County Public Health (HCPH), we recommend the resources below for other COVID-19 vaccine providers in the area.




Additional Resources

For more information about COVID-19 vaccinations, please visit the CDC website.