RP15 Rockpile Dry Wine Yeast

RP15 Rockpile Dry Wine Yeast

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Formerly known as VQ-15 Yeast

RP-15 is a recently isolated Californian strain that was selected from spontaneous Rockpile Syrah fermentations by Vinquiry in collaboration with winemaker Jeff Cohn. RP-15 is a moderate rate fermenter with average nitrogen demands. Due to its' ability to develop a structured yet lush and balanced mouthfeel, RP-15 is ideally suited to making rich, concentrated reds. Initial winemaker feedback has indicated that RP-15 does well with emphasizing varietal flavor and red fruit character. In addition, with careful hydration and nutrients, RP-15 delivers good mineral and spice notes to wine. RP-15 is recommended for Syrah, Zinfandel, Cabernet Sauvignon and Merlot. Best results from 59 to 90 degrees F, with an alcohol tolerance to 16%.

Click here for a PDF of the MoreWine Manual on re-hydrating wine yeast.

Click here for a PDF of the MoreWine Yeast and Grape Pairing Guide.

Community Q&A

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Why did you choose this?
MoreFlavor Store
I have used it in the past.
Shari J on Sep 16, 2021
Best I’ve found for big Italian reds
Robert C on Sep 3, 2021
I have used it in the past.
Shari J on Sep 16, 2021
Worked great last year for my Lodi AVA Petite Sirah
All Things Rocketry on Sep 9, 2021
Best I’ve found for big Italian reds
Robert C on Sep 3, 2021
Prior Year Experience
Bruce M on Sep 1, 2021
Used it before
Just toolin on Aug 27, 2021
Best yeast for our Cabernet Sauvignon, Merlot and Petit Sirah wine.
Dawn A L on Aug 16, 2021
It works great.
E.J. Z on Aug 13, 2021
Favorite previously used
Matthew S on Jul 12, 2021
used before
Pamela S on Jun 1, 2021
Was recommended to bottle condo on a Russian River Consecration Clone
Rodney L on May 17, 2021
read vinnie uses it for bottle conditioning
Michael I on Feb 17, 2021
Recommended for Consecration Clone
Mark M on Nov 17, 2020
good for country wine
George S on Nov 10, 2020
Produces unbelievable results for rich reds
Andrew Pohlman on Oct 29, 2020
Cust Serv Recommended
Mitch M on Oct 22, 2020
We have merlot grapes and are trying a new yeast
Edward O on Sep 30, 2020
Have used before.
Daniel S on Sep 12, 2020
Been using it successfully for 5 seasons
Michelle U on Sep 11, 2020
read articles
Thomas M on Sep 11, 2020
Because I need it
Philip K. B on Sep 9, 2020
Past performance
Leonard H on Aug 28, 2020
Have used in the past and enjoyed the fruitiness
Matthew S on Aug 5, 2020
high temp tolerance
Francis D M on Jun 10, 2020
Bottle ferment high gravity beer
Jonathan M on Jun 5, 2020
Trying new
Robert C on Apr 21, 2020
russian river used
Speece C on Dec 2, 2019
good for big CA reds - zin, syrah, cab
Fred P P on Oct 17, 2019
I really like this yeast for Zinfandel, but have used for Merlot and Pinot noir
Ira K on Oct 9, 2019
Used it regularly
Michelle U on Oct 3, 2019
used it before and liked the results
Royce G on Sep 25, 2019
Ian P on Sep 21, 2019
High alcohol resistance for higher brix
JAMES G on Sep 18, 2019
Making a California Cab.
Caleb K on Sep 17, 2019
i used it last year and I loved its results
David F on Sep 13, 2019
Works great, and very easy to use.
E.J. Z on Aug 28, 2019
previous preference for fruit
Matthew S on Aug 28, 2019
This is a great yeast and I have always had wonderful results, especially for my Zinfandel!
Stephen F on Aug 28, 2019
Used for a Petite Syrah
Kirk Lindstrom on Aug 28, 2019
Making wine with this product combination for several years - good outcome.
Tania D on Jul 29, 2019
A preferred strain for Zinfandel
Robert M on May 17, 2019
Using this as a bottling yeast for MoreBeer’s Consecration clone.
Steve T on Apr 23, 2019
for wine fest bottle condition
Valued C on Apr 9, 2019
new yeast for reds
david p on Oct 12, 2018
Making a Pinot Noir
Lisa M on Oct 11, 2018
Trying new yeasts. Was recommended
Brian K on Oct 11, 2018
Based suggestions in research, trying in Cab and Merlot
Jim S on Sep 19, 2018
MoreWine Yeast & Grape Pairing Info Sheet
Terry W S on Sep 12, 2018
Used for Syrah and ZIN for passed 2 seasons, very satisfied with the results
Michelle U on Sep 11, 2018
It’s a new yeast - let’s give it a try
Matthew R on Sep 6, 2018
My buddy switched to RP15 for his red wines. He has been pulling in some top awards in winemaking competitions. While many things go into a great wine, my buddy feels that this yeast is a major factor in his final product. Based on his experience, I will try it on my California Syrah to year.
Mark B on Sep 3, 2018
Worked great last year for my Lodi AVA Petite Sirah
All Things Rocketry on Sep 9, 2021
Prior Year Experience
Bruce M on Sep 1, 2021

4.6 / 5.0
5 Reviews
5 Stars
4 Stars
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1 Star
Rated 5 out of 5
Smoothest Cab Ever!
October 2020: I used RP15 in a batch of Cabernet Sauvignon at the recommendation of Patrick at the Concord store. It had to take some summer heat in primary at 85F and still performed very well. The sample taken at bottling time was beyond amazing - complex floral aromas with tones of caramel and bodacious mouthfeel. It clearly needs more aging, but all the components, including smooth tannins, were present, and should lead to a spectacular Cab given time in the cellar. I'll update this in Oct 2022 after the cab has aged 2 full years. I expect it's gonna be great! We are about to make a Lodi Old Vine Zin and we will use RP15.
October 11, 2020
Rated 5 out of 5
This yeast is perfect for high brim Zinfandel grapes.
September 14, 2020
1 year ago
Rated 3 out of 5
Good flavors but had some H2S issues
I used this with and old vine zin and with syrah. The old vine zin developed a rubber sent after 4 months of aging. Cured it with a small dose of copper sulfate and Reduceless. However, I believe it was the RP15. Again tried RP15 with a split fermentation of Syrah. One primary with Syrah yeast and one with RP15. Rehydrated both yeasts according to the instructions/ morewine red wine manual. Followed dosing and nutrient schedule exactly. Noticed a HS2 sent after pressing only in the a carboy with RP15, not the Syrah yeast. Fermentation temps on either topped out at 80F. Cured with Noblese and a small dose of Reduceless. Both wines are very tasty, but I would probably be careful using RP15. I won't be using it again. I had never had a H2S problem prior to using RP15.
August 2, 2018
over 3 years ago
Rated 5 out of 5
work horse!!
I used this yeast for my fall 2017 cab- merlot blend and it did a fabulous job!! The air temps were in the upper 80s and the must got really hot, and fermentation went on as planned. Great !! would use again!!
January 27, 2018
Rated 5 out of 5
I have had good success over three vintages using Rockpile with zinfandel, primitivo, merlot, grenache, and mourvedre. There have been no fermentation issues, and I have even run MLF concurrently (approximately halfway through primary) several times. It seems to really bring out dark and red berry, but where I find it differentiating itself the most is in the earthy and mineral aspects. It creates excellent mouthfeel and complexity. The description says something about bringing out varietal character, and would guess this is because of how it emphasizes the fruit and mineral notes.

I generally inoculate with much less yeast than recommended by the manufacturer. I do this for a longer lag time and somewhat slower fermentation. I do this with all my fermentations, but can't say I would recommend that others take this route. I mention it because it has not led to any issues with the Rockpile becoming stressed, sluggish, or stuck.
July 26, 2016