White Labs

In Focus: California Ale Yeast

WLP001 California Ale Yeast
This yeast is famous for its clean flavors, balance and ability to be used in almost any style ale. It accentuates the hop flavors and is extremely versatile.
Attenuation: 73-80%
Flocculation: Medium
Optimum Fermentation Temperature: 68-73°F
Alcohol Tolerance: High

MiniFerment data:
What is MiniFerment? White Labs yeast strains were tested using the same wort in its proprietary MiniFerment process. The process simulates large-scale brewing. To learn more about MiniFerment click here. To learn more about understanding the data, click here.

As-is Diacetyl	Total Diacetyl	As-is 2,3-Pentanedione	Total 2,3-Pentanedione	Ethanol	Acetaldehyde	Ethyl Acetate	Isoamyl Acetate	1-Propanol	Isoamyl Alcohol
27.18ppb	78.12ppb	N/A	8.61ppb	4.825%ABV	14.005ppm	17.46ppm	N/A	37.23ppm	90.185ppm

Final Gravity: 2.8 P
Hours it takes to get to 50 percent attenuation: 40

Audio:

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Reviews:
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"Beer is super clean "
By: MB Pasadena
Date: Jan. 13, 2010
Beers brewed: Imperial India Pale Ale
Comments: This yeast out performed my expectations. Made a starter 24 hours before I pitched into an IIPA with a OG of 1.079. I was hoping to have a finishing gravity of 1.020, actual was 1.012. Beer is super clean; no esters or diacetyl.

"Can't wait to compare ... "
By: Rick Realsen
Date: Dec. 5, 2009
Beers brewed: American Pale Ale
Comments: I brewed a couple of batches of High Gravity American IPAs with this yeast a year ago and am still drinking them with great delight. 001 is definitely a high attenuation yeast that produces a brew with the right balance of sweetness that does not overpower the flavor and purpose of brewing a highly hopped high gravity IPA. This brew has a fresh clean hoppy flavor that is not overly sweet. I will continue to use it. I am currently brewing two batches of similar style ales using the WLP051 California Ale yeast which is supposed to produce a sweeter brew and fuller body. Can't wait to compare these yeasts.

"I always have on hand ... "
By: Dariush
Date: Nov. 19, 2009
Beers brewed: everthing from a mild to a Imperial stout
Comments: I love this yeast and have used it in a wide range of gravities, from 1.03 to 1.10 as well as a variety of styles, American browns to Russian Imperial stouts. I believe the flavor profile is best between the second and fifth generation. Very versatile yeast that I always have on hand and am never disappointed with.

"Perfect!"
By: Don
Date: July 31, 2009
Beers brewed: Double IPA 150 IBUs
Comments: This yeast is an absolute workhorse that never disappoints. I just finished a Double IPA with OG 1.110. I did a 12 gallon batch and put in a pound and a half of hops. I made a starter up 2 days ahead of time. I pitched two vials of yeast in each Erlenmeyer flask that had 1.8 liters of 1.040 wort made with extra light DME. I used a stir plate for the starters (one for each 6.5 gallon carboy). I was shooting for 80% attenuation. Yesterday, I did a gravity reading (it’s been in the primary for 2 weeks) and got a reading of 1.020! Perfect! Again and again, this yeast does everything it is supposed to do and then some. It always produces clean, crisp flavors and often greater attenuation (especially when using a starter) than advertised. Well done!

"This has been going on for over a year now ... "
By: Lance B
Date: April 27, 2009
Beers brewed: Pales/IPA's/Stouts
Comments: WLP001 California Ale Yeast. Where do I start? I have brewed approximately 18-20 Pales, IPA's and Imperial Stouts repitching yeast from one vial. This has been going on for over a year now with great results. 5 gallon batches in a 6.5 gal primary. 75% of these have blown out of a 6.5 gal carboy, so I suggest a blow off hose for primary fermentation. Terminal gravity has been reached within 7 days even with 1.066 OG IPAs. Yeast produces excellent beers that have a nice clean dry hoppy finish.

"Great yeast for high gravity beers"
By: Greg Kozak
Date: April 10, 2009
Beers brewed: Double IPA
Brewery Name: Westinghouse Brewing
Comments: First double IPA. 5.5 gallon batch, 18 lbs. of grain, and pure Michigan Clover Honey (about 2 lbs.) for an OG of 1.084. Prepared a 1.5L starter on a stir plate. Yeast was amazing! Final gravity of 1.012, for an apparent attenuation of 85%! Great yeast for high gravity beers.

" ... airlock still bubbles ... "
By: Tuan
Date: March 17, 2009
Beers brewed: Rauchbier
Comments: The OG is 1.058. After 15 days, the airlock still bubbles every 3 minutes or so. Is that normal for this yeast? My fermenting temperature is 68 degrees F. Thanks. PS: Other styles come out great! :)
WL response (in part): What you are seeing is probably dissolved carbon dioxide coming out of solution rather than the byproducts of active fermentation. Some shaking will knock out the CO₂.

" ... look no further ... "
By: Mike
Date: Feb. 6, 2009
Beers brewed: Robust Porter
Comments: Even though this yeast is rated a 2 for the Porter styles I wanted to keep a level of consistency with all my ales. Despite using a ton of malt this yeast still lets the hops shine through creating some nice fruity undertones and terrific balance. I also didn’t add any hops after the last 30 minuets and the beer still has a faint hop aroma. If you like to bring out the hop flavor of your ales (any ale) look no further than the California ale.

" ... this yeast bounced right back"
By: Kash
Date: Oct, 16, 2008
Beers brewed: Strong Honey Ale
Comments: I was not very nice to this yeast. I direct-pitched two vials into a 1.077 OG wort, without making a starter. Honey was about 30% of the total fermentables, which I'm sure didn't exactly make the wort nutrient-rich. I also didn't use high-protein malts in the mash, so that didn't help the nutrient situation. And the cherry on top: I fermented below the recommended temperature range. However, this yeast bounced right back! The lag time was somewhat long (about 48 hours), but after that, the yeast took off. The beer finished at 1.015. Primed with raw, freshly mashed wort (SG 1.070), it took about a month to bottle-condition. The finished beer had some residual sweetness, but was very clean-tasting with very little ester character.

"Great yeast"
By: dave
Date: January 17, 2008
Beers brewed: American Pumpkin Ale
Comments: This was such an easy yeast to use. I fermented about 67 degrees F. Made about 79% attenuation at OG 1.06 with no starter made. Started quickly and finished quickly. Great yeast.

" ... you really can't fail with this yeast"
By: David Stuedemann
Date: October 02, 2007
Beers brewed: American IPA
Comments: This is my old standby, you really can't fail with this yeast. It has a high tolerance for temperature variation, is a fast starter, and is highly attenuative. The malt and hop characteristics are very clean, and it's great for high gravity brews. It's fairly neutral with nice esters and slight diacytel which make for consistent, delicious beers. You don't have to wonder whether it's going to work out or not.

"Took off quickly ... "
By: rod
Date: March 05, 2007
Beers brewed: Selected "Clone Brews" recipes
Comments: I found the California Ale yeast to be very aggressive resulting in shorter fermentation times. I usually split my tubes in two because I am cheap. I didn't use a starter, only half the contents of a tube and still cut primary fermentation by two days. The only drawback I noticed was a more pronounced alcohol finish on bottled beers. Did not notice it on same beer when kegged. A note on aerating wort: Since I use a 5gal bucket as a primary fermentor, I use a restaurant-sized whisk and just mix it vigorously.

FAQ:
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I am toward the end of a recent brew (bottle conditioning phase) and had a question about WLP001 California Ale Yeast. O.G. was 1.07 and I wanted about a 1.017 FG (76% atten) but I only got to 1.024 (65% atten). I want to try the recipe with the California again soon, and am wondering what I should do differently to get the attenuation to about 76%.

The issue may be with the fermentation itself or with the available sugars present to the yeast. Even though your mash schedule may seem correct, try dropping everything in your system 10 degrees Fahrenheit. That is where you would start to see if your wort becomes fermentable.

You could also try different base malt. For fermentation, make sure you pitch the yeast between 70-75F, then drop to a different temperature if you like after fermentation begins. Keep the temperature consistent during fermentation, even fluctuations during the evening can stall the yeast. Proper aeration at the beginning of fermentation will also be helpful. This is one thing that separates homebrewers and commercial breweries, commercial breweries have almost no problems with stuck fermentations because they have tight temperature control and they saturate the wort with oxygen before they pitch the yeast. One way to get more oxygen into the fermentor is to use a fish type of aquarium pump. Put an air filter on that you can get at homebrew shops, and turn on for one hour after pitching. Don’t use a stone, it will foam too much, just a small bore tubing, this will add big enough bubbles to mix things up, and you get good oxygen delivery into the wort. An additional tip is to transfer the beer when it gets to 1.025; the transfer itself helps to add a little oxygen and mix things up.

I had a question regarding the High Gravity yeast (WLP099 Super High Gravity Yeast). I used WLP001 California Ale Yeast for the initial fermentation of a 1.120 wort, and it pooped out at 1.032. I wanted to use the high gravity yeast to finish it off. Would the best route be to make a starter and aerate and pitch just like a new beer or will oxidation be a problem?

Make a starter and aerate the starter, not the beer. That will take care of the oxidation problem and still give the yeast a good start.

I live in India, and I recently got a couple of vials from an American homebrew store. They were in shipping for about 5 days and with an ice pack. Once they arrived, I put them in my refrigerator right away. Today, I used it for a batch of American Brown Ale I made. I had several questions about the yeast.

1. It was not white in color, and the yeast appeared brownish.

This is normal - we package the yeast with protein and lipids to keep them healthy in shipping.

2. I shook the vial (after removing from the fridge) and left it at room temp. When I opened the vial, there was a lot of frothing.

It built up pressure during shipping and warming to room temperature. One tip is to break the cap when you first take it out of the refrigerator, while most of the CO2 is still in solution. Then vent the cap periodically as the yeast warms up.

3. There was a peculiar smell which I haven’t got from any dry yeast.

This is normal for people to think it smells different; concentrated liquid yeast will have a different aroma. When yeast grows in beer, it smells different for a number of reasons, including the presence in beer of hops.

I brewed this past week while it was pretty hot outside. I used my counter-flow chiller w/ inline oxygenator as usual but could not get the wort temp down below about 83 Fahrenheit. Being in a hurry I went ahead and pitched the yeast (WLP001 California Ale Yeast). Not asking for a definitive answer but how big of a mistake was this?

Thank you for your inquiry. There will be higher levels of esters and fusel alcohols but since you were able to lower the temperature fairly quickly this may not have too much effect on the final beer. WLP001 is one of the more tolerate strains to higher temperatures. Ale yeast are more tolerant to higher temperatures, lager yeast do not survive well over 80F. Ale yeast will survive to 90F.