This page is general health information, not medical advice. It cannot tell you whether you have an infection. A clinician can, and the testing options on this site are a good place to start.

Most people who look for free std testing boston options are hoping for a pop-up event with a date and a banner. Boston does not work quite that way. The free testing here mostly happens at standing clinics with set weekly hours.

This guide shows you how to turn those hours into a plan for this month. It covers what to bring, how to choose a clinic, what to expect on the day, and what to do afterward.

One note on timing. The clinic information below is current as of our latest check, and hours can shift around holidays. Always call the clinic before you go.

A Quick Word on "Events"

We could not find a published calendar of one-day community testing events for Boston this month. The Boston Public Health Commission says people can get tested for STIs through its Getting Tested page, and the Mayor's Health Line at 617-534-5050 offers free, confidential health information and referrals in many languages. If you want to know about a pop-up near you, that line is a good first call.

For everything else, the dependable option is a clinic with free testing and regular hours. Those are the "events" you can count on, and several are open on evenings and Saturdays.

What You Need Before You Go

A phone. You may need it to call ahead, use an online portal, or receive results.
Your insurance card, if you have one. Some clinics bill insurance when it exists. Having no insurance does not stop you from being seen at the clinics below.
A photo ID, if you have one. Ask the clinic whether it is required. Codman Square Health Center states that it provides testing and treatment regardless of citizenship status.
A short list of dates. Think of when you last had sex with a new partner, and when you were last tested.
Your questions. Write down anything you want to ask, such as which infections are included in the visit.
A bit of time. Walk-in clinics can have a wait, and check-in often closes before the posted end time.

Step-by-Step: Planning Your Free Test This Month

Step 1. Decide what kind of visit fits you

Some clinics offer an "express" visit for people with no symptoms and no known exposure. Others see people with symptoms or a recent exposure on a different track. The CDC STI Treatment Guidelines (2021) say a clinician decides which tests are right based on your history, so be ready to describe yours honestly. Nobody there is judging you.

Step 2. Pick a clinic from the free options

Here is what each clinic publishes about cost and access. Confirm by phone before you travel.

Boston STD Clinic at Boston Medical Center, 725 Albany St., 9th Floor, Suite 9C, Boston. Its page lists free routine testing for HIV, chlamydia, gonorrhea, syphilis and hepatitis C, plus cost assistance for people without insurance. Appointments are made by phone at 617-414-2803. The page does not say whether walk-ins are accepted.
Fenway Health Sexual Health Clinic, 1340 Boylston Street, 4th floor, Boston. Walk-in hours are first come, first served. Fenway lists Tuesday 1 to 7 p.m., Wednesday and Thursday 3 to 7 p.m., and Friday 9 a.m. to 12 p.m., with Monday 9 a.m. to 4 p.m. by appointment only. Check-in closes 30 minutes before the end time. Fenway says uninsured patients can be seen free through grant funding. Call 617-267-0159. The page is aimed at gay, bisexual and other men who have sex with men, transgender and gender diverse people, and their partners.
TrueCare@MAC testing at the Multicultural AIDS Coalition, 9 Palmer Street, Roxbury. Testing is listed as free, with or without an appointment. Hours are Monday, Tuesday, Thursday and Friday 10 a.m. to 5 p.m., Wednesday 12 to 7 p.m., and Saturday 11 a.m. to 4 p.m. Testing starts about 30 minutes after opening and ends before closing. Call 617-442-1622.
X-Clinic at Codman Square Health Center, 637 Washington St., Dorchester. Costs follow a sliding fee schedule, and all insurance is accepted. Express visits are walk-in during operating hours. Codman's own pages list different schedules, so call 617-822-8350 to confirm which hours are current.

The CDC's GetTested directory also lists the Boston Public Health Commission at 774 Albany St. (617-534-3976) as free HIV, hepatitis C, chlamydia, gonorrhea and syphilis testing. It does not list hours, so call first. Our local testing list keeps these details in one place.

Step 3. Match the clinic to your calendar

Open a calendar for the month and mark two or three possible windows. Evenings are available at several places: Fenway runs walk-in hours until 7 p.m. on three weekdays, and MAC is open until 7 p.m. on Wednesdays. Codman and MAC both list Saturday hours.

Choose one main option and one backup. If your first choice has a long line, you can go to the second.

Step 4. Call ahead

A two-minute call can save a wasted trip. Ask these questions:

Are you seeing walk-ins this week, and when does check-in close?
Which infections does a routine visit include?
Is there any charge, and what happens if I do not have insurance?
How and when will I get my results?

For context, Fenway says results take 3 to 5 business days. Other clinics may differ, and none of the pages we reviewed promise a specific turnaround beyond what they publish.

Step 5. Think about timing

A test can only detect an infection once there is enough of it to measure. The CDC says the window period for HIV depends on the test. A nucleic acid test can detect HIV about 10 to 33 days after exposure. A lab antigen/antibody test usually detects it about 18 to 45 days after exposure. Fingerstick antigen/antibody tests take longer, about 18 to 90 days.

If your exposure was recent, tell the clinician the date. They can explain which tests make sense now and whether a repeat test later would help. If you may have been exposed within the last few days, ask the clinic about post-exposure options such as PEP. Boston STD Clinic, Fenway Health and Codman list PEP among their services.

Step 6. Go to your visit

Arrive early, since walk-in lines can move slowly. Staff will ask about your health and sexual history. Answer as openly as you can, because it helps them choose the right tests. Depending on the clinic and your history, testing may involve a urine sample, a swab, or a blood draw.

If you are under 18, Massachusetts law (M.G.L. c. 112, s. 12F) lets a minor who reasonably believes they are at risk of exposure consent to care for sexually transmitted infections without a parent. The City of Boston tells people 13 or older they can get confidential STI testing without parental permission.

Step 7. Plan for your results

Ask how you will be contacted and whether it is safe to leave a message at your number. Write down the date you were told to expect results. If that date passes, call the clinic rather than assuming no news means anything.

If a result needs follow-up, a clinician will talk with you about next steps. Bacterial infections like chlamydia, gonorrhea and syphilis, and trichomoniasis, are curable with treatment from a clinician. HIV, herpes and HPV are not curable, but they are treatable or manageable with care from a clinician.

Massachusetts treats these records seriously. Under M.G.L. c. 111, s. 119, venereal disease reports and records are non-public, with disclosure only on a judicial order or to officials whose duties entitle them. For the detailed rules on what is reported and to whom, ask the clinic or the Boston Public Health Commission.

Tips for a Smoother Visit

Go early in the clinic's window. First-come, first-served clinics can fill up before check-in closes.
Bring a backup plan. If one clinic is full, have the next one on your list.
Ask about everything in one visit. Ask whether HIV, hepatitis C, chlamydia, gonorrhea and syphilis are all included. Boston STD Clinic lists all of them as routine.
Ask about prevention. Several clinics list PrEP, and Fenway lists doxy-PEP. The CDC issued guidance on doxy-PEP in 2024, and a clinician can tell you whether it applies to you.
Bring your partner if you like. Some clinics welcome partners, and Fenway names them in its description of who it serves.

Common Mistakes to Avoid

Assuming a pop-up exists. Do not plan around an event you have not confirmed with a phone call.
Arriving at closing time. Fenway notes that check-in closes 30 minutes before the end time, and MAC's testing hours end before its posted closing time.
Trusting an old address. One directory lists an older MAC address in Dorchester. The MAC page lists 9 Palmer Street in Roxbury.
Mixing up two providers. Boston Medical Center's STD clinic and the Boston Public Health Commission's listing are both on Albany Street, but they are different providers with different numbers.
Skipping the follow-up. If you were told to come back or retest, put it on your calendar before you leave.

What You Can Reasonably Expect

Most people who go for routine testing finish a visit in a reasonable amount of time and leave with a plan for getting results. Many tests may come back negative, which a clinician can explain in the context of your timing and exposures. A negative result may not rule out a recent exposure that is still within a window period, which is why timing questions matter.

If something is found, clinics that offer treatment can usually start the conversation about next steps. Costs and coverage vary, so ask about them early.

To put the need in context, CDC county data republished by Boston 25 News put the 2021 chlamydia rate in Suffolk County, which includes Boston, at 807.8 per 100,000 people, and gonorrhea at 298.0 per 100,000. Those are county figures, not city-only numbers, and they are one reason routine testing is a normal part of health care here.

For a wider view of prices and options beyond free visits, read our guide to STD testing in Boston, where to go and what it costs.

Free STD Testing Events in Boston This Month