A xu month bazi birth places you in the Dog month (戌 Xū), the ninth month of the Ba Zi (八字 bāzì) year and the close of autumn. In Ba Zi the month pillar (月柱 yuèzhù) is the season pillar, and it is the single biggest factor in how strong or weak your Day Master (日主 rìzhǔ) reads. The Dog is one of the four Earth months, and each stores a different element; the Dog is the one that stores Fire.
The Dog month opens at the solar term Han Lu (寒露 Hánlù), around 8 October, not on the first of the calendar month. Ba Zi months turn on solar terms (节气 jiéqì), so an early-October birth may still belong to the Rooster month. Because the transitional Earth months weigh so heavily on balance, confirm your exact month boundary with the free chart calculator before reading it.
Your xu month bazi pillar by year stem
The month stem comes from your year stem by the Five Tigers rule (五虎遁 wǔhǔ dùn). Read your year stem on the left and take the Dog-month pillar.
| Year stem | Dog month pillar |
|---|---|
| 甲 Jiǎ | 甲戌 Jiǎ Xū |
| 乙 Yǐ | 丙戌 Bǐng Xū |
| 丙 Bǐng | 戊戌 Wù Xū |
| 丁 Dīng | 庚戌 Gēng Xū |
| 戊 Wù | 壬戌 Rén Xū |
| 己 Jǐ | 甲戌 Jiǎ Xū |
| 庚 Gēng | 丙戌 Bǐng Xū |
| 辛 Xīn | 戊戌 Wù Xū |
| 壬 Rén | 庚戌 Gēng Xū |
| 癸 Guǐ | 壬戌 Rén Xū |
A 甲 or 己 year returns 甲戌 — the only month where the Jia column lands back on 甲 itself. The pairing of year stems (甲/己, 乙/庚, 丙/辛, 丁/壬, 戊/癸 share columns) is fixed by the Five Tigers rule, and the complete month stem table sets out all five columns month by month.
What the Dog month does to a chart
Xu is transitional Earth, so Earth is prosperous, but it is dry warm earth, the sun-warmed ground of late autumn. Its signature is that it is the Fire reservoir (火库 huǒkù), the storehouse where the year’s Fire is kept banked, and it still holds the fading Metal of the season just passed. Set it against the other Earth months and its character is clear: unlike the frozen Ox or the wet Dragon, the Dog is warm and dry with Fire sleeping inside it. An Earth Day Master born here is strong and solid, the firmest of the four Earth months. A Fire Day Master, though out of season, finds a real root in the storehouse and is not as weak as autumn suggests. A Metal Day Master has leftover strength but is beginning to fade. Wood is drying out, and Water is warmed and reduced by the earth.
The stored Fire is what makes the Dog month a favourite anchor for Fire charts that would otherwise struggle in autumn and winter. Whether that banked Fire is usable in your chart is a balance question worked through in strong versus weak Day Master and read against the five elements cycles.
Element states at the end of autumn
By the five states (旺相休囚死 wàng xiàng xiū qiú sǐ), the Dog still answers to the Metal season: Autumn = Metal season, branches 申酉戌, Aug 7 – Nov 6 (from Li Qiu 立秋 to before Li Dong 立冬).
| Element | State | Reading |
|---|---|---|
| Metal | 旺 wàng — Prosperous | The season is your own element: maximum native strength; the chart usually needs outlets, not more support |
| Water | 相 xiàng — Supported | The season feeds your element: strong by backing; comfortable, resourced, sometimes over-sheltered |
| Earth | 休 xiū — Resting | Your element feeds the season: energy flows out; mild drain, the retired-general state |
| Fire | 囚 qiú — Confined | Your element controls the season: fighting uphill against the times; effortful, gritty |
| Wood | 死 sǐ — Dormant | The season controls your element: weakest baseline; support and timing matter more than effort |
Two corrections apply on top of the season grid. Classical doctrine also gives Earth its own prosperity in the four transitional months (土旺四季 tǔ wàng sìjì), strongest in late summer (未), so Earth here firms up well past Resting as the month closes. And Fire’s Confined grade is softened by the branch itself, since the Dog is Fire’s storehouse — an out-of-season Fire with a place to stand.
What sits inside the branch
The Dog branch hides Wu Earth as its main charge, with Xin Metal carried over from autumn and Ding Fire held in storage. The verbatim listing, first stem = main qi (本气 běnqì): Xū 戌 (Dog): Wù 戊 (Yang Earth), Xīn 辛 (Yin Metal), Dīng 丁 (Yin Fire). That buried Fire is what makes Xu the Fire reservoir. See the Xu branch hidden stems for how the three are weighted.
The month palace
As the palace of career climate and of parents, a Dog-month pillar classically suggests a loyal, guarding, principled early environment: someone whose start protected and stored warmth rather than spent it. Read it as the ground your working life came from, not a fixed result. It closes the autumn the Rooster month ran at its peak, and hands the year toward the deep water of the Pig month.
How to verify this pillar in your chart
The Dog month runs from Han Lu (~8 October) to Li Dong (立冬 Lìdōng, ~7 November), so births in that window show 戌 in the month branch. Match the stem through your year stem — a 辛 year gives 戊戌, and the whole 辛 column is checkable in the Xin-year month stem table. An Earth Day Master here should also read Wu Earth born in autumn for the season-level judgement this month anchors.
Dog month FAQ
What opens the Fire reservoir?
The classical trigger is the 辰↔戌 clash from the Six Clashes (六冲 liùchōng) list: a Dragon branch striking the Dog is read as the storehouse being knocked open, releasing what it banks. Whether that release helps your chart depends entirely on whether the chart wants Fire — a judgement made on the whole eight characters.
Is the Dog month good for Fire Day Masters?
Better than the calendar suggests. The season marks Fire Confined, but the branch holds Ding Fire in storage, so a Fire Day Master keeps a root here that the Monkey and Rooster months never offer.
I was born on 6 October. Which month am I?
Very likely still the Rooster, since Han Lu falls around 8 October, but the boundary hour moves each year. Plot the exact birth time in the calculator before reading either pillar.
To see how your xu month bazi pillar and its stored Fire swing your own Day Master strength, plot your full chart free with the Butcher Boy calculator.