The season question is a weather question
Taipei's food scene runs all year; the calendar does not close it. What the calendar does change is how comfortable three hours of evening walking and eating will feel. The Central Weather Administration's English site carries the authoritative record: Taipei summers (roughly June through September) are hot and humid with a typhoon season concentrated in July–September, the plum-rain stretch in late spring brings multi-day drizzle, and autumn through winter delivers the mildest, driest evenings the city offers. That seasonal shape, not a festival schedule, is the honest answer to "when".
Summer evenings have a case anyway: the heat breaks after dark, markets run at full steam, and cold desserts and iced drinks are at their best. Winter evenings are cool enough that hot, brothy street food hits harder — which is why night-market crowds in the city build through the cooler months. Neither is wrong; they are different meals.
What the tours themselves commit to
The listings checked here run in the evening and stay short. The Yansan small-group tasting is about two hours; the private Yansan tour and the Ningxia-Raohe market evening run about three hours each. None publishes a seasonal calendar or promises specific stalls — and one listing states plainly that its operator may alter the itinerary in inclement weather, with a 100% charge for no-shows defined as arriving fifteen minutes late. Translation: rain does not cancel the city, but it can change your route, and your punctuality is on you in any season.
Day of week matters more than month in practice. Weekends and the eve of public holidays pack the markets harder; that is a pattern, not a promise, because no checked source publishes crowd counts for a given date. If your trip spans both, put the guided tour on a weekday and keep a market evening free for the weekend chaos — the reverse wastes the guide's crowd management on an easy night.
Book the date, then verify the forecast
The practical sequence: fix the evening early in your trip so a washed-out night can be retried, book the tour or mark the market, then check the Central Weather Administration forecast the day before and the morning of. Taipei rain is often a shower rather than a write-off, and market lanes keep operating in ordinary rain. If a named typhoon is anywhere near the island, treat that evening as lost and rebook — the operator's weather clause exists for exactly that.
Common questions
Which month is best for a Taipei food tour?
October through April evenings are the most comfortable for hours of walking and eating. Summer works if you accept heat, humidity and a typhoon season concentrated in July–September.
Do food tours run year-round?
The listings checked here state no seasonal shutdown: they run evening slots of two to three hours, with one operator stating the itinerary may be altered in inclement weather rather than canceled outright.
Are weekends really busier at the night markets?
In practice, yes — weekends and holiday eves draw the biggest crowds. But no checked source publishes crowd figures, so treat it as a planning pattern, not a guarantee.
What happens if it rains on my tour night?
Ordinary rain does not stop the markets; one checked listing states the operator may alter the itinerary in bad weather. For a named storm, expect rebooking — and remember the same listing charges no-shows 100%, so communicate changes early.