On a Monday night in New York, you can sit in at a jam that starts at 11:45 PM and runs until 4 AM. On the first Saturday of the month just outside Washington, DC, there’s one at 11 in the morning. And at a Monday session in Tokyo, the players pay ¥1,800 while the listeners get in free.
We built the Jazz Jam Finder so bass players could find nights like these. A jam only gets on it if the venue’s or the host’s own page shows it’s running, and on 8 October 2026 we re-checked every one. That left 177 recurring jazz jam sessions in 15 cities. Here’s what they add up to: the busiest nights, when jams start, who gets in free, and how often a venue tells you there’s a bass amp.
- 177 jams
- 15 cities
- Checked 8 Oct 2026
Quick answer
Monday has the most weekly jams: 30, against 18 on Saturday. The median jam starts at 7:30 PM. 56% of jams run every week or most weeks, and 39% run once or twice a month. Of the 140 jams whose listings mention cost, 65 say players get in free. And only 12 of the 177 say there’s a bass amp to use.
How we built the list
- What counts. Recurring jazz jams that are open to musicians who want to sit in: weekly, every other week or monthly. Jazz in the broad sense, from bebop and standards to Latin jazz and jazz-funk. No blues jams, open mics, private sessions or one-off events.
- A primary source for every jam. The venue’s own site, calendar or ticket page, or the host’s own site, had to show the jam running now.
- A second check. A checker who didn’t do the research re-opened every source on 8 October 2026. Of 290 candidate jams, 177 passed. The rest failed or couldn’t be confirmed on a primary source, so they aren’t counted.
- Only what the listing says. If a venue’s page doesn’t mention a bass amp, we count it as “not stated,” not as “no amp.”
The details are in Method and limits at the bottom.
Which night has the most jazz jams?
Monday, if you count the jams that run every week or most weeks. There are 30 of them on Mondays, ahead of Wednesday (27) and Sunday (25). Count only the strictly every-week ones and Monday still leads, 21 to Wednesday’s 20.
Count every jam, monthly ones included, and it’s close to a three-way tie: Wednesday and Sunday have 43 each and Monday has 42. Sunday has the most of the less-than-weekly kind, 18, so it catches up when they’re counted.
Friday and Saturday are the quietest jam nights however you count them: 19 and 18 weekly jams, 27 and 29 in all. Weekends still have something, though. Of the 24 jams that start before 5 PM, 19 run on a Saturday or Sunday.
See the numbers
| Night | Every week or most weeks | Less than weekly | All jams |
|---|---|---|---|
| Monday | 30 | 12 | 42 |
| Tuesday | 22 | 14 | 36 |
| Wednesday | 27 | 16 | 43 |
| Thursday | 22 | 15 | 37 |
| Friday | 19 | 8 | 27 |
| Saturday | 18 | 11 | 29 |
| Sunday | 25 | 18 | 43 |
How often do jazz jams run?
A little more than half run every week or most weeks. 84 jams happen on a set night every week, and 16 more run most weeks or several nights a week, which makes 100 of the 177 (56%). Another 69 (39%) run once or twice a month, on a pattern like “first Tuesday” or “second and fourth Thursday.” The last 8 run on changing dates or only now and then.
Tokyo’s list is the most mixed. Only 4 of its 34 sessions run on a set night every week. Another 8 run most weeks, 7 of them on several days a week or most days. Sixteen run once or twice a month, and 6 run on changing dates. If a Tokyo session is on your list, check that month’s calendar.
What time do jazz jams start?
The median start time is 7:30 PM, across the 170 jams that post one. 91 of them (54%) start between 7:00 and 8:59 PM, and the 7 PM hour alone has 50.
The rest spread out to both ends of the day. 24 jams start before 5 PM, and Tokyo has 9 of them. Six more Tokyo sessions add afternoon sessions on weekends or some dates. The earliest start on the list is the SMT Jazz Jam in Takoma Park, on our Washington, DC page: 11 AM on the first Saturday of the month.
At the other end, 21 jams start at 10 PM or later. Paris has 7 of those and New York has 6. The latest start is Chicago’s Green Mill jam at 1 AM, which makes it early Saturday morning.
By city, Paris starts latest, with a median of 10:30 PM. Washington, DC starts earliest, with a median of 6 PM. One thing to know before you plan your night: the start we count is the first time the venue lists, and at some jams that’s the house band’s opening set, with the open jam after it.
See the numbers
| Start | Jams |
|---|---|
| 11 AM hour | 1 |
| 12 PM hour | 1 |
| 1 PM hour | 5 |
| 2 PM hour | 11 |
| 3 PM hour | 3 |
| 4 PM hour | 3 |
| 5 PM hour | 6 |
| 6 PM hour | 14 |
| 7 PM hour | 50 |
| 8 PM hour | 41 |
| 9 PM hour | 14 |
| 10 PM hour | 10 |
| 11 PM hour | 10 |
| 12 AM hour | 0 |
| 1 AM hour | 1 |
Which cities have a jazz jam every night?
Six of the 15 cities have a jam on the list for every night of the week: New York, Tokyo, the San Francisco Bay Area, Paris, Philadelphia and Boston. That count includes monthly jams, though. If you want a jam that runs every single week, on all seven nights, only two cities have one: New York and Paris.
Tokyo covers all seven nights too if you count the sessions that run most weeks, like the ones listed for “most days” or “most nights.” Boston and Philadelphia have weekly jams six nights a week. In the San Francisco Bay Area, the Friday and Saturday jams on the list are monthly.
See the numbers
| City | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Jams |
|---|---|---|---|---|---|---|---|---|
| New York City | Every week | Every week | Every week | Every week | Every week | Every week | Every week | 35 |
| Tokyo | Every week | Every week | Most weeks | Most weeks | Most weeks | Most weeks | Every week | 34 |
| San Francisco Bay Area | Every week | Every week | Every week | Every week | Monthly or less | Monthly or less | Every week | 20 |
| London | Every week | Every week | Every week | Every week | None | None | Every week | 15 |
| Paris | Every week | Every week | Every week | Every week | Every week | Every week | Every week | 13 |
| Chicago | Every week | Monthly or less | Monthly or less | Every week | Every week | None | None | 9 |
| Philadelphia | Every week | Every week | Every week | Monthly or less | Every week | Every week | Every week | 8 |
| Washington, DC | Every week | Every week | Every week | None | None | Monthly or less | Most weeks | 8 |
| Berlin | Monthly or less | Most weeks | Every week | Every week | None | None | None | 7 |
| Los Angeles | Every week | Every week | Monthly or less | Every week | None | None | Every week | 7 |
| Seattle | Every week | Monthly or less | None | Monthly or less | None | None | Every week | 6 |
| Amsterdam | Monthly or less | Every week | Every week | None | Every week | None | Every week | 5 |
| Boston | Every week | Every week | Every week | Every week | Every week | Every week | Monthly or less | 5 |
| Toronto | None | Every week | None | None | Most weeks | Every week | Monthly or less | 4 |
| New Orleans | Every week | None | None | None | None | None | None | 1 |
Do players get in free at jazz jams?
At a lot of them, yes. 140 of the 177 listings say something about what the jam costs. Of those, 65 (46%) say players get in free: 52 are free for everyone and 13 are free for the musicians who play. Nine of those 65 still ask you to buy a drink or food. Another 8 jams charge musicians less than the audience.
The city makes a big difference. All 5 Amsterdam jams and 21 of New York’s 35 say players get in free. London is the city of the musicians’ rate: 10 of its 15 jams set a separate price for players, free at 6 of them and £5 at the other 4.
Tokyo works the other way. None of its 34 sessions says players get in free, and 32 post a charge. For 22 of those 32, the charge is between ¥2,000 and ¥3,000, and 23 of the 32 include a drink or require a drink order. Four jams elsewhere call themselves free but add a set charge per person, like a fee on the bill or a surcharge on your first drink. We counted those as paid.
Will there be a bass amp at the jam?
Don’t count on it. Only 12 of the 177 listings say there’s a bass amp to use. Seventeen say there’s a bass to play, and 10 of those say it’s an upright or double bass. Put together, 153 jams (86%) say nothing about bass gear at all.
Tokyo venues list the most bass gear: 5 of the 12 amps and 9 of the 17 basses. In Paris, 6 jams say there’s a double bass on site. JASS Club’s Friday session, for one, lists a grand piano, double bass and drums. None of New York’s 35 listings mentions a bass amp.
Not stated isn’t the same as no. A listing that doesn’t mention an amp isn’t saying there isn’t one, but it isn’t promising one either.
See the numbers
| The listing… | Jams | Share of 177 |
|---|---|---|
| Says something about the cost | 140 | 79% |
| Says players get in free | 65 | 37% |
| Names a bassist as host or in the house band | 46 | 26% |
| Says there's a bass to play | 17 | 10% |
| Says there's a bass amp | 12 | 7% |
What that means if you play bass
- Ask before you go. Message the host or the venue and ask whether there’s a bass amp and, if you play upright, whether there’s a house bass you can use.
- If you can’t find out, bring your own. That means your bass, plus a small amp you can carry if you play electric or use a pickup.
- Expect to share the bass chair. 46 listings (26%) say a bassist hosts the jam or plays in the house band. Will Lyle’s advice, from lesson 5 of his course From Unknown to Unavailable: use the sign-up sheet if there is one, and if a bassist is already on the stand, ask, “Hey, is it cool if I play?” There’s more of his jam etiquette for bass players on the Jam Finder.
City by city
- New York City (35 jams). The biggest list, and one of two cities with an every-week jam on all seven nights. 21 of its 35 jams say players get in free. Smalls alone runs a late-night jam Monday to Thursday from 11:45 PM and an afternoon jam Friday to Sunday from 2 PM. Not one New York listing mentions a bass amp.
- Tokyo (34 jams). Almost as many as New York, and the most daytime playing: 15 sessions start before 5 PM or add afternoon sessions. Seven run several days a week or most days. None says players get in free, and the median charge is ¥2,500. Tokyo venues also list the most bass gear.
- San Francisco Bay Area (20 jams). A jam on every night of the week, but the Friday and Saturday ones are monthly. Seven listings name a bassist as host or in the house band, the most after New York and Tokyo.
- London (15 jams). The musicians’ rate city: 10 of 15 jams set a separate price for players, free or £5. Two say there’s a bass amp.
- Paris (13 jams). The latest-starting city: 7 of its 13 jams start at 10:30 PM or later. It’s the other city with an every-week jam on all seven nights, and it has the most jams that say there’s a double bass on site (6).
- Chicago (9 jams). Home of the latest start on the list, the Green Mill jam at 1 AM. Chicago’s weekly jams run on Monday, Thursday and Friday.
- Philadelphia (8 jams) and Boston (5 jams). Short lists that cover a lot of nights, with weekly jams six nights a week in both. Philadelphia has 3 jams that start at 11 PM or later.
- Washington, DC (8 jams). The earliest-starting city, with a median start of 6 PM. Three of its 8 jams start before 5 PM, including the SMT Jazz Jam in Takoma Park at 11 AM.
- Berlin (7 jams). All 7 fall between Monday and Thursday.
- Los Angeles (7 jams). Two of its 7 jams say there’s a bass amp. One says bass spots are limited, so clear it with the organizer first.
- Seattle (6 jams). Four of its 6 jams run once or twice a month.
- Amsterdam (5 jams). Every jam on the list says players get in free.
- Toronto (4 jams). Two late-night jams back to back, Friday and Saturday at 11:30 PM.
- New Orleans (1 jam). Only one jam passed our rule. A Monday afternoon jam at Fritzel’s, for example, is on a local radio station’s calendar but not on the club’s own site, so it stayed off. That’s a limit of our method, not a verdict on the city.
FAQ
What night has the most jazz jam sessions?
On our list of 177 jams in 15 cities, Monday has the most weekly jams: 30, ahead of Wednesday (27) and Sunday (25). Counting monthly jams too, Wednesday and Sunday have 43 each and Monday has 42. Friday and Saturday are the quietest nights either way.
What time do jazz jam sessions start?
The median start is 7:30 PM, and 91 of the 170 jams that post a start time begin between 7:00 and 8:59 PM. 24 start before 5 PM and 21 start at 10 PM or later. Paris starts latest, with a median of 10:30 PM.
Do you have to pay to play at a jazz jam?
Often not. Of the 140 jams whose listings mention cost, 65 say players get in free and 8 more charge musicians less. It depends on the city: 21 of New York’s 35 jams say players get in free, while none of Tokyo’s 34 sessions does, and most Tokyo sessions charge between ¥2,000 and ¥3,000.
Should I bring a bass amp to a jam session?
Ask the host first, and bring one if you can’t find out. Only 12 of the 177 listings say there’s a bass amp, and only 17 say there’s a bass to use. A listing that doesn’t mention an amp isn’t saying there’s none, but it isn’t promising one either.
Method and limits
- What counts. Recurring jazz jam sessions open to musicians who want to sit in, running weekly, every other week or monthly. Jazz in the broad sense, including bebop, standards, Latin jazz, organ jazz, jazz-funk and vocal jazz jams. We left out blues jams, rock nights and open mics that aren’t jazz, private and school-only sessions, one-off events and closed venues.
- Finding jams. For each city, researchers used jazz calendars, aggregators and local jazz sites to find candidates, then went to each venue’s own page. They logged 290 candidate jams and set aside 325 other leads early on, such as venues that had closed, listings that were out of date, blues or open-mic nights, and shows that weren’t open jams.
- Checking jams. A jam counted only if a primary source showed it running now: the venue’s own site, calendar or ticket page, or the host’s own site, with a dated session on or after 1 September 2026 or a standing weekly listing on a clearly current calendar. A second checker re-opened every source on 8 October 2026. 177 jams passed, 13 of them after the checker found primary evidence the first pass had missed. 23 failed, and 90 couldn’t be confirmed on a primary source.
- Counting nights and frequency. A jam that runs on several nights counts once on each, so the night totals add up to more than 177. “Every week” means a set night every week, including seasonal weekly jams. “Most weeks” covers listings like “most Mondays,” “several times a week” and “most days.” “Once or twice a month” includes every other week and every four weeks. Five jams run several times a month on changing dates and 3 run only now and then.
- Start times. We used the first start time each listing gives. Seven jams post no time. Tokyo sessions that add afternoon sessions are counted at their main start and mentioned separately. “Before 5 PM” and “10 PM or later” are the cutoffs for daytime and late night.
- Prices. We sorted each listing’s cover line as free for everyone (drink minimums and donation requests allowed), free for the musicians who play, cheaper for musicians, pay what you can, a set charge, or unclear. “Players get in free” means the first two. Four listings that say “free” but add a set charge per person count as paid. For Tokyo, we used the first yen figure each listing gives.
- Bass gear and bassists. Counted only when the venue’s or host’s page says so: a bass amp to use, a bass to play (upright or electric), or a bassist who hosts or plays in the house band.
- Limits. These 15 cities aren’t a random sample of the world, and a city’s count reflects how well its jams show up on venue and host pages, not only how many it has. Jams that only post on social media we couldn’t open, or only on community and radio calendars, were left out, which is why New Orleans has just one. This is a snapshot of 8 October 2026, and jams start, move and stop all the time. With 1 to 35 jams per city, the per-city figures are small numbers. And “not stated” is never “no.”
To cite this: Better Bass Lessons, “The State of the Jazz Jam, 2026,” blog.betterbasslessons.com, October 2026. The listings behind every number are on the Jazz Jam Finder, each linked to its venue or host page.
Go deeper
From Unknown to Unavailable
A field manual from NYC bassist Will Lyle for bassists who can play but aren’t getting the call, and don’t know why.
Sources
- Better Bass Lessons, Jazz Jam Finder: 177 jams in 15 cities, each checked against its venue or host page on 8 October 2026, with city pages for New York City, Tokyo, San Francisco Bay Area, London, Paris, Chicago, Philadelphia, Washington, DC, Berlin, Los Angeles, Seattle, Amsterdam, Boston and Toronto.
- Smalls, late-night jam session (11:45 PM to 4:00 AM, no cover charge for musicians) and afternoon jam session (2:00 to 5:15 PM).
- School of Musical Traditions, jams and open mics (Jazz Jam, first Saturdays, 11:00 AM to 12:30 PM).
- Green Mill, Green Mill Jam Session (1 AM to 3:30 AM).
- JASS Club, JASS Session (Fridays at 22h30; grand piano, double bass and drums on site; free entry for musicians).
- Cafe Dolce Vita, events page (Standard Jazz Session, Mondays 18:30 to 22:00, ¥1,800 for players, free for listeners).
- WWOZ, Open Jazz Jam Session with the Matinee All Stars Band at Fritzel’s Jazz Club, and Fritzel’s Jazz Club, whose own site lists no jam.
- Will Lyle, From Unknown to Unavailable, lesson 5, “Getting in the Room: Shows, Jam Sessions, House Sessions and Saying Yes to Everything,” Better Bass Lessons.
