IYA07 Flagship - Imperial Organic Yeast

IYA07 Flagship - Imperial Organic Yeast

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A07 Flagship is a versatile strain prized by home and craft brewers alike for its tremendously clean character. A07 Flagship performs well at conventional ale temperatures, but can be used in the low 60s to produce remarkably crisp ales. Due to its middle of the road flocculation, filtration or fining is required to achieve a crystal clear beer.

  • Temp: 60-72°F, 16-22°C
  • Flocculation: Med-low
  • Attenuation: 73-77%
  • Cell Count: 200 Billion

White Labs Equivalent: California Ale – WLP001
Wyeast Equivalent: American – WY1056

Usage Instructions:
  • ​Store refrigerated until ready to pitch
  • Shake and kneed pouch to homogenize slurry
  • Sanitize the sealed pouch
  • Open and pitch entire contents into well-aerated wort

Please Note: For best results we Always recommend ordering an Ice Pack with your liquid yeast. Ice Packs can be found below in the "You might Also Need" section.

Please Note: When choosing an ice pack option beware that the liquid yeast will not arrive cold even when shipped together. Ice packs and insulated mailing options are designed to keep the yeast colder for longer during shipment, but they will not ensure that your yeast arrives cold. We will not replace liquid yeast that arrives warm. During warmer months we strongly recommend you choose dry yeast.

Item # IYA07
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.37 LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 52 answers
Why did you choose this?
MoreFlavor Store
Amazing yeast, expensive but good
Todd U on Nov 2, 2022
Great for Two Hearted Ale clone!!!
Joshua B on Aug 24, 2022
Amazing yeast, expensive but good
Todd U on Nov 2, 2022
Heard good things and I’m making a pumpkin pastry stout!
Vince C on Sep 27, 2022
Great for Two Hearted Ale clone!!!
Joshua B on Aug 24, 2022
Purchased for a Pineapple IPA
Mark Russell J on Aug 9, 2022
So I can ferment the Cream Ale that I want to make and then drink
Alexandra O on Aug 4, 2022
cell count, haven't tried
Elijah L on Jul 29, 2022
I like the imperial line of yeast
Joe Selgrath on Jul 15, 2022
review recommend
mr on Jul 15, 2022
Love Imperial Yeast
Chris R on May 21, 2022
I like this yeast
Yamil R on May 3, 2022
Wanted a liquid yeast
Alice Andrus on Apr 30, 2022
Consistent quality product.
KMcQuarters on Apr 11, 2022
Yeast count!!
Patrick A on Mar 21, 2022
Makes the beer
Alexandra O on Mar 3, 2022
My recipe calls for it
David S on Feb 1, 2022
I like it
David M Frausto on Jan 22, 2022
Recommended to go with this recipe
David C on Jan 10, 2022
Highly recommended by coworker and the fellas on Basic Brewing Radio
Corey A on Jan 10, 2022
brian h on Jan 7, 2022
Great for a golden Stout
Bryce Tuttle on Dec 31, 2021
I like turtles
Richard F on Dec 22, 2021
KaijuSF on Dec 20, 2021
Use before and comfortable with it.
Richardson M on Dec 9, 2021
Trying it for the first time
Michael V on Nov 12, 2021
Best yeast out there.
Ben C on Oct 8, 2021
I have used previously with good results
KELLY G. on Sep 16, 2021
To ferment beer.
Matthew S on Sep 9, 2021
works great
brian h on Aug 21, 2021
To brew a Two-Hearted clone.
Kyle Heon on Aug 21, 2021
It was recommended
Daniel F on Jul 30, 2021
first time
Paul E on Jul 17, 2021
I like it
Don on Jul 6, 2021
Good deal of luck with this when OG is over 60. Otherwise, flocc leads to turbid beer.
C C on Jul 6, 2021
Erik A on Jun 25, 2021
Cell count (200 billion)
Mark W on May 29, 2021
best yeast available
Doug Haviland on Apr 23, 2021
my favorite yeast!
Bill C on Apr 16, 2021
Many cells
Barry Thumm J on Apr 14, 2021
Restart house strain.
Chris H on Mar 30, 2021
Temp Range
Gerald J G on Mar 24, 2021
haven't tried it yet
Steven K on Mar 19, 2021
To ferment my wort
Ethan C on Mar 18, 2021
Its awesome
Carl P on Mar 11, 2021
its good
Jonathan I on Dec 29, 2020
Bill T on Dec 5, 2020
Need it
Brian M on Dec 3, 2020
Making Bell's Two Hearted Ale.
Joshua B on Nov 10, 2020
to make beer with
Alexandra O on Nov 4, 2020
I have heard great things about this yeast but haven't tried yet.
Jesse K on Sep 4, 2020
ferment beer
Ryan Jones on Jul 16, 2020
Heard good things and I’m making a pumpkin pastry stout!
Vince C on Sep 27, 2022
Purchased for a Pineapple IPA
Mark Russell J on Aug 9, 2022
The A07 Imperial pouch arrived swollen. I hadn't seen an Imperial pouch swollen before. Is the yeast still healthy? Or should I return it?
Seyed Mirhosseini on Aug 21, 2020
BEST ANSWER: First great yeast selection. I have used there yeast several times. One pouch in the past was slightly swelled. But I always create a yeast starter to make sure the yeast is ready to go when adding to the brew. So you should have a no problem as long as the date of expiration is with in the manufactures suggested use by date.Still think yeast starter you will never go back.

4.6 / 5.0
24 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
very active
The shipment was delayed and the cool pack was almost done. but the this yeast still made it and worked great
July 28, 2022
4 months ago
Rated 5 out of 5
Imperial Yeast is the best
Imperial Flagship A07 my go to for Irish Red and pale ales. I have been using Imperial Yeast for years it’s the best. Just wish Morebeer would carry the full lineup of Imperial Yeast.
April 14, 2022
8 months ago
Rated 5 out of 5
finished a pliny the elder clone kit with this, fermented crazy fast and tastes delicious
May 5, 2021
1 year ago
Rated 5 out of 5
great yeast
Great yeast finishes clean
September 15, 2020
over 3 years ago
Rated 5 out of 5
Fantastic yeast, chugs quickly and cleanly
The Imperial yeast brand is my favorite to use and I used Flagship for a hoppy pale. With a starter and stir plate, the yeast was ready to go and ferm was done in 3-4 days (1050 SG). Fantastic yeast.
May 13, 2020
over 2 years ago
Rated 5 out of 5
Amazing yeast and company. The viability of Imperial yeast packs is incredible. I always make a starter and the amount of slurry I get from an Imperial yeast pack is epic. I usually pitch on the low end of the temp range and still need to deal with blow offs. Great product and company.
April 28, 2020
over 2 years ago
Rated 5 out of 5
Great Yeast
The Lag time on this yeast was less about 16 hours. All 200 billion yeast cells are hard at work. Cannot wait to try out the flavor that this adds. Will buy again!
April 13, 2020
over 2 years ago
Rated 5 out of 5
Made the beer!
February 15, 2020
over 2 years ago
Rated 5 out of 5
Normally I get a starter batch going a few days before brew day but I was pressed for time. Pitched this yeast right after transferring from the brew kettle to my Fermzilla. Pitched at about 71 degrees. Fermented under natural pressure (capped at 14PSI) for 1 week. My reading this morning had be at about 79% attenuation on my Pliney the Elder clone. My O.G. was 1.069 and todays reading is 1.014.

Took a sample of the beer along with the hydrometer reading and it is a solid brew, no funky flavors just all my hops I added.

During the fermentation from day 2 to day 5 the yeast were eating so furiously I had to show my wife and kids. My 7 year old asked me to explain why there was a tornado of activity in the fermentation tank.

Highly recommend! I will try this strain again with a bigger DIPA.
January 31, 2020
over 2 years ago
Rated 5 out of 5
Great yeast works fast but wish there was a warning for new brewers . After using this yeast for the first time the foam (Krausen) was pouring out of the airlock. I bought another fermenter a 7gal one to avoid this and use a blow off tube for my 6 gal fermenter. I learned about top cropping yeast so I do this each week with this yeast.
January 22, 2020
over 2 years ago