Business Opening Dates 2026: Auspicious 開市 Days from August to December

Choosing an auspicious date for a business opening in 2026 follows the same classical method merchants have used for centuries: take the days the Chinese almanac marks as favorable for opening, strike any day that clashes the owner's birth animal, and stay clear of the calendar's break days. This page lists every remaining grand opening date for 2026, August through December, that at least two independently published almanac calendars agree on. Where the calendars disagreed on a date, we dropped it rather than averaging, so this is the overlap the tradition itself agrees on.

What the almanac marks for an opening

The Chinese almanac tags each day with 宜 (yi, "favorable for") and 忌 (ji, "avoid") activities, and the one that matters here is 開市 (kaishi, "opening the market"). It is the classical merchant's marking: the right day to trade for the first time, and also the right day to resume trade after a pause, which is why the same marking governs the first day back after Chinese New Year. Modern lists often print it as 開業 (kaiye, "opening a business"); the two labels read the same almanac marking. A day marked 宜:開市 is a candidate opening day. A day marked 忌:開市 is not, however well it fits the renovation schedule.

The tradition applies the marking to more than ribbon-cuttings. A shop's first day of trade, a restaurant's soft opening turning official, an office moving from setup to signing, an online store flipping from test mode to live: any "first day of business" is an opening in the almanac's sense, and people who keep the custom pick the day the same way.

How the tradition picks an opening day

Step 1: start with a marked day. Only days carrying 宜:開市 or 宜:開業 qualify. The tables below have done this step, and kept only the dates on which two or more published almanac calendars agree.

Step 2: strike the owner's clash day. Every day in the Chinese calendar opposes exactly one zodiac animal, an opposition called 冲 (chong, "clash"). The rule for an opening is centered on the owner: a day that clashes the boss's birth animal is out, whatever else the almanac says about it. Where there are partners, the tradition checks each of them, giving the most weight to whoever leads the business. Every date below lists its clash animal so the check takes seconds. If you want your animal's whole standing for the year, the 2026 luck checker reads it from your birth year.

Step 3: avoid the break days. Among the almanac's twelve day-officers, 破日 (pori, the "break" day) is the day set against its own month, and the tradition marks it unsuitable for nearly everything, openings very much included. The verified list below excludes them.

Step 4: the customs of the opening itself. Folk custom gives an opening its theatre, and the theatre has a logic: an opening should be loud, red, and generous. The lion dance, 舞獅 (wushi), is the classic centerpiece in Hong Kong, Singapore, and Malaysia, ending with the lion plucking the hung greens, 採青 (caiqing), for luck the business "harvests" on day one. Red banners and couplets go up over the door, ribbon is cut, mandarin oranges change hands, and staff traditionally receive a red packet on opening morning so the first money the business gives out is lucky money; the customary amounts follow the same conventions as any red envelope. Firecrackers did the noise-making historically; where they are restricted, drums and cymbals carry the job. All of it is folk celebration, not requirement. The tradition's point is simply that a business should begin the way it means to continue: warm, visible, and open-handed.

Two honest notes on 2026

The seventh lunar month. From 13 August to 10 September 2026 (published calendars differ by a day on the close) the calendar sits in the seventh lunar month, the ghost month, 鬼月 (guiyue). The almanac still marks 宜:開市 days inside it, and the list below includes them, marked with an asterisk. But across Hong Kong, Singapore, and Malaysia many business owners simply do not open in this month, whatever the almanac marks, and that custom is widespread. Follow your own practice; the dates are given as the almanac gives them.

Rat days in a Horse year. 2026 is a Horse year, and a day whose clash animal is the Horse is a Rat day, which sets the day against the year itself. The stricter almanac schools call this the year breaker, 歲破 (suipo), and sit such days out for major beginnings even when the day is otherwise marked favorable. Two dates below, 29 October and 22 November, are Rat days of this kind. Our sources mark them favorable for opening, so they are listed, but if you follow the stricter reading, skip them; the Tai Sui 2026 page explains the year-clash logic in full.

The verified opening dates, August to December 2026

Every date below appears as favorable for opening (開市 or 開業) in at least two independently published almanac calendars. Disagreed dates were dropped. An asterisk marks the seventh lunar month.

August 2026

September 2026

October 2026

November 2026

December 2026

How to use the list

Check the owner's animal against the clash column first; that single check removes one or two dates from most shortlists and settles the rest. If you are avoiding the seventh lunar month, September still leaves you four clean dates from the 16th onward, and October is the strongest month of the season with six agreed dates. Weekend openings are well served: 22 August, 5 September, 4 October, 11 October, 22 November, and 6 December all land on a Saturday or Sunday.

A last word on why this list may look shorter than others you have seen. Published almanacs descend from different schools of date selection, and their 宜:開市 lists genuinely differ. Rather than pick a school silently, we kept only the dates the sources agree on and dropped the rest; the almanac guide explains where those differences come from, and the FAQ covers the short questions, including what the tradition says when no agreed date fits your launch window.

---

Sources and standard: the dates above were cross-checked on 11 Jul 2026 against multiple published Chinese-almanac calendars, including the Wisdom Life farmers' almanac (智慧生活農民曆), the Sanjiu almanac (三九黃曆), the Chahuangli almanac (查黃曆網), the Haomingzi almanac calendar (好名字網), and the Tiantian Jiri calendar. A date was listed only when at least two independent sources marked it favorable for opening; dates the sources disagreed on were dropped rather than averaged. All dates are presented as the tradition marks them: cultural material, not a guarantee of outcomes. Doctrinal accuracy is pending in-house review.