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.


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
Best yeast out there.
Ben c on Oct 8, 2021
To ferment beer.
Matthew S on Sep 9, 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
Trying to follow 3 Floyd's recipe with the yeast they use
Ryan C C on Jun 30, 2020
I need yeast, my LHBS is out of business
Michael Brierley on May 3, 2020
It's yummy
Joshua W on May 2, 2020
It is appropriate for the beer that I am brewing. I love using Imperial!
Ed F on Apr 29, 2020
imperial yeast is the best
Rob S on Apr 29, 2020
I've never used Imperial before and wanted to see if the higher cell count will make any difference in the final product.
John M on Apr 27, 2020
Love it!
Guzman S on Apr 25, 2020
used liquid yeast before. convenient
Gregg S on Apr 23, 2020
for the porter
Matthew J on Apr 10, 2020
Robert on Apr 8, 2020
I live I portland where this is made but wanted to increase carbon footprint
JDub on Apr 8, 2020
I like it
Michael Hall on Apr 7, 2020
worked well in the past
Jeffrey C on Apr 1, 2020
clean crisp qualities
John C F on Mar 31, 2020
I want authentic malt for a german style.
Valued C on Mar 30, 2020
Like this brand
Scott M on Mar 21, 2020
Because Imperial Independence wasn’t available
JDub on Mar 18, 2020
Trying this brand for the first time
Robert F G on Mar 18, 2020
My go to ale yeast
Richard Schramm on Mar 17, 2020
I have used it before and had great results.
David C on Feb 13, 2020
recommended yeast
gabriel l on Feb 5, 2020
Trying this and going to compare it with WLP001 out of curiosity
Eric Hansen on Jan 22, 2020
Love Imperial
JOHN C on Jan 10, 2020
I've heard it's awesome and I'm making a West Coast style Pale Ale that will be dry hopped with a lot of hops :)
Paul R on Dec 31, 2019
I have used previously with good results
KELLY G. on Sep 16, 2021
works great
brian h on Aug 21, 2021
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
22 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
finished a pliny the elder clone kit with this, fermented crazy fast and tastes delicious
May 5, 2021
7 months ago
Rated 5 out of 5
great yeast
Great yeast finishes clean
September 15, 2020
over 2 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
1 year 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
1 year 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
1 year ago
Rated 5 out of 5
Made the beer!
February 15, 2020
1 year 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
1 year 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
1 year ago
Rated 5 out of 5
Aggressive fermentation and hits FG every time. My go to.
January 13, 2020
1 year ago
Rated 5 out of 5
Buy again!
Got a fuller and slower fermentation than some more expensive supposedly higher alcohol resistant yeast!
January 10, 2020
1 year ago