How much caffeine is in Starbucks Iced Peach Green Tea?
A Grande (16 fl oz) Starbucks Iced Peach Green Tea has 25 to 30 mg of caffeine.
That's about a quarter of a cup of brewed coffee, and 7% of the 400 mg a day the FDA cites for most healthy adults.
Source: starbucks.com · checked 10 Nov 2026
When did you have it?
Had at 3 pm, about 9.8 mg is still in you at an 11 pm bedtime. That should not affect most people’s sleep.
Ranges: the chart uses the middle of the published range (28 mg for this size).
Your whole day, every drink, in the free CaffeineIQ check. The iPhone app is coming soon.
Sizes
| Size | Volume | Caffeine | mg per fl oz |
|---|---|---|---|
| Tall | 12 fl oz (355 ml) | 20 to 25 mg | 1.8 |
| Grande shown above | 16 fl oz (473 ml) | 25 to 30 mg | 1.8 |
| Venti | 24 fl oz (710 ml) | 40 to 45 mg | 1.8 |
| Trenta | 30 fl oz (887 ml) | 55 to 60 mg | 1.9 |
Source: starbucks.com · checked 10 Nov 2026
Latest time to drink it
For an 11 pm bedtime, a Grande (16 fl oz) Starbucks Iced Peach Green Tea stays under the 50 mg most people sleep fine with, even late in the evening. The table works it out for other bedtimes and for how sensitive you are: it is the latest time to start one so that the caffeine left stays under the line all night.
| Bedtime | Very sensitive under 25 mg | Average under 50 mg | Not very sensitive under 100 mg |
|---|---|---|---|
| 9 pm | Any time | Any time | Any time |
| 10 pm | Any time | Any time | Any time |
| 11 pm | Any time | Any time | Any time |
| Midnight | Any time | Any time | Any time |
| 1 am | Any time | Any time | Any time |
For a Grande (16 fl oz) Starbucks Iced Peach Green Tea, average clearance (half-life 5 h), 8 hours of sleep. "Any time" means even one at bedtime stays under the line.
How long it lasts
The caffeine from a Grande (16 fl oz) Starbucks Iced Peach Green Tea peaks in your blood about 75 minutes after you start it, at roughly 24 mg. Half of it is gone in about 5 hours for an average adult; that ranges from roughly 3 to 7 hours, and longer in pregnancy or with some medicines.
| Time after | 3 hours | 6 hours | 9 hours | 12 hours |
|---|---|---|---|---|
| Still in you | 20 mg | 13 mg | 8.6 mg | 5.6 mg |
So one had at 3 pm leaves about 9.8 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
Starbucks Iced Peach Green Tea is stronger than 38% of the 38 teas we track, by caffeine per serving.
Per fluid ounce (1.8 mg) it is stronger than 28% of them.
To reach 400 mg in a day you would need about 14 of these.
Less caffeine
- Gold Peak Chai Tea Latte 25 mg, 14 fl oz bottle
- Starbucks Chamomile Mint Blossom Tea 25 mg, Grande
- Gold Peak Sweet Tea 20 mg, 16.9 fl oz bottle
More caffeine
- Snapple Tea 30 mg, 16 fl oz bottle
- Honest Tea Mint Green Tea 35 mg, 16.9 fl oz bottle
- Oolong Tea 30 to 40 mg, 6 fl oz cup
Same caffeine: Green Tea, Jade Leaf Matcha, Starbucks Iced Black Tea.
FAQ
Is Starbucks Iced Peach Green Tea high in caffeine?
No, it is low. A Grande (16 fl oz) Starbucks Iced Peach Green Tea has 25 to 30 mg, which is 29% of the 95 mg in an 8 fl oz cup of brewed coffee.
How much caffeine is in a Tall Starbucks Iced Peach Green Tea?
A Tall (12 fl oz) Starbucks Iced Peach Green Tea has 20 to 25 mg of caffeine, 6 mg less than a Grande (16 fl oz) Starbucks Iced Peach Green Tea.
How much caffeine is in a Trenta Starbucks Iced Peach Green Tea?
A Trenta (30 fl oz) Starbucks Iced Peach Green Tea has 55 to 60 mg of caffeine, 30 mg more than a Grande (16 fl oz) Starbucks Iced Peach Green Tea.
Can I drink Starbucks Iced Peach Green Tea at night?
For most people, yes: even late in the evening a Grande (16 fl oz) Starbucks Iced Peach Green Tea stays under 50 mg at an 11 pm bedtime.
How long does the caffeine in Starbucks Iced Peach Green Tea last?
It peaks about 75 minutes after you start it. Of the 25 to 30 mg, about 13 mg is still in you 6 hours later and 5.6 mg after 12 hours, for an average adult with a 5-hour half-life.
Does Starbucks Iced Peach Green Tea have more caffeine than a cup of coffee?
No. A Grande (16 fl oz) Starbucks Iced Peach Green Tea has 25 to 30 mg; an 8 fl oz cup of coffee has 95 mg.
Method and limits
The caffeine figure comes from starbucks.com; recipes, brewing and batches vary, so a real serving can differ. The curves use a standard one-compartment model with an average 5-hour half-life and a sleep-friendly line of 50 mg; your own body may clear caffeine faster or slower. How it works has the details.
These are estimates for information, not medical advice.
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