Green Tea Steep Timer

Common uses for a green tea steep timer

Loose-leaf Japanese green tea
Chinese pan-fired greens
Multiple short infusions
Iced green tea preparation

Green tea is unoxidised, which is why it is far more sensitive to water temperature than black tea. The compounds that make it bitter and astringent — catechins and caffeine — extract quickly and accelerate sharply with heat, so the same leaf that is delicate at 70 °C turns harsh at 95 °C in the same two minutes.

Time and temperature trade against each other. A shaded Japanese gyokuro is brewed cool and briefly, often around 60 °C for under a minute, because its high amino acid content is what you want in the cup and heat pulls bitterness out ahead of it. A pan-fired Chinese longjing takes hotter water for longer. Neither range is a standard; both are long-established convention, and the useful habit is to keep water temperature fixed while you adjust time, so you can tell which one changed the result.

Why boiling water ruins green tea

Water straight off the boil extracts catechins and caffeine much faster than the sweeter amino acids, so the cup arrives bitter and thin at the same time. Letting a kettle stand for two or three minutes off the boil brings it into a far more forgiving range without any equipment.

If your green tea has always tasted bitter and you have been shortening the steep to compensate, the temperature is the more likely culprit. Fix that first and you will usually find you can steep longer, not shorter.

Multiple infusions

Good loose-leaf green tea is worth re-steeping, and the later infusions are not weaker so much as different — the first pulls the most delicate aromatics, later ones a rounder, more vegetal character.

Keep subsequent steeps short. A common approach is to extend each infusion slightly over the last while leaving the temperature alone: perhaps 60 seconds, then 75, then 90. Leaves that have already given up their most soluble compounds need a little longer, but not the doubling people often reach for.

Long-established convention rather than a published standard. Treat these as starting points and adjust to your own taste and leaf.

Green tea steeping by variety
Variety	Water temperature	First steep
Gyokuro (shaded Japanese)	50–60 °C	90–120 s
Sencha (Japanese)	70–80 °C	60–90 s
Bancha (Japanese)	80–85 °C	60 s
Longjing / Dragon Well	75–85 °C	2–3 min
Bi Luo Chun	75–80 °C	1–2 min
Genmaicha	80–85 °C	60 s
Jasmine green	75–85 °C	2–3 min

A kettle left to stand 2–3 minutes off the boil lands around 80–85 °C without a thermometer.
For repeat infusions, extend each steep slightly rather than doubling it.

Source: ISO 3103 — Tea: preparation of liquor for use in sensory tests

Sources

ISO 3103 — Tea: preparation of liquor for use in sensory tests , International Organization for Standardization (ISO 3103:2019) — accessed 2026-07-28

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❓ Frequently Asked Questions

Why does my green tea taste bitter?

Almost always the water is too hot. Boiling water extracts catechins and caffeine much faster than the sweeter amino acids, so the cup turns bitter and thin at once. Let the kettle stand two to three minutes off the boil and try the same steep time again before shortening it.

What temperature should green tea be brewed at?

Between about 50 °C for shaded gyokuro and 85 °C for pan-fired Chinese greens — see the table above. These are long-established conventions rather than a standard. Keep temperature fixed while you adjust time, so you can tell which change did what.

How many times can I re-steep green tea?

Good loose-leaf green tea gives two or three worthwhile infusions, sometimes more. Later steeps are different rather than simply weaker — rounder and more vegetal. Extend each one slightly over the last instead of doubling the time.

Is ISO 3103 the right way to brew green tea?

No. ISO 3103 specifies how to prepare tea for sensory comparison in a laboratory, so that testers judge the same liquor. It is a testing method, not a recipe for a cup you want to drink, and its single six-minute steep would over-extract most green tea badly.

How do I get the right temperature without a thermometer?

Boil the kettle and let it stand. Two to three minutes off the boil lands roughly in the 80–85 °C range in a normal kitchen, which suits most Chinese greens and bancha. For gyokuro and sencha you want cooler still, so pour into a second vessel first to shed more heat.

Should I use more leaf or a longer steep for stronger tea?

More leaf. Extending the steep past the ranges above extracts proportionally more bitterness than flavour, so the tea gets harsher rather than stronger. Increasing the leaf keeps the balance while raising the intensity.