Winter Greenhouse Gardening class, natural yeast questions

Hello all,
I am starting a natural yeast question and answer forum at -- if you have a question about natural yeast that you would like answered, please email the question to or go to the Facebook page and post your question there. I hope to have a video tutorial available soon as well.  

The 2015 Greenhouse Gardening class will be available in Utah and also as an online class! (Online class will include video, a live call-in session with Caleb, and free seed mailed to you.)

9am to 1pm Jan. 31, Alpine City Hall
20 North Main Street, Alpine, Utah

$39 through Jan. 26 ($55 after Jan. 26)
$58 2-person ($29 per person!) registration through Jan. 26
TO REGISTER: Go to and click on “classes”
or go to

In this class you will learn:
  • NEW THIS YEAR Many of you have expressed a desire for a cheaper permanent winter greenhouse -- so I designed and built one! I will show you my new solar thermal greenhouse, which I completed this fall and is now full of vegetables. This is a permanent winter greenhouse with a door and room to stand up, and room for a chair inside (I love to spend time in my winter greenhouses)  which costs less than $500 to build! This is a GAME CHANGER! This structure can also help you lower your winter heating bill for your house! I will show you all the thermal design principles you must know to build one of your own!
  • We will also tour my $6,000 geothermal greenhouse, where you will be able to pick fresh from the garden to taste my winter gardening varieties!
  • We will also tour my backyard cold frames, and backyard winter garden vegetables growing with no, zero, protection!
  • You will also learn “greenhouse ocean” principle, which is critical for growing success
  • everything you need to know about how to size your greenhouse correctly -- not as easy as you think!
  • most importantly, best greenhouse vegetable varieties -- without these, none of it works!
  • how to design and use a thermal chimney to keep your greenhouse from freezing in winter
  • how to maximize productivity so you really, truly can feed your family from a small space!
  • venting options,
  • polycarbonate,
  • the candle mistake,
  • winter tomatoes,
  • nutrient recycling,
  • self-sufficient watering,
  • seed-starting in January,
  • variety testing,
  • what is most useful to grow,
  • and using a greenhouse for emergency preparedness. At the beginning of class, we will drive about 1.5 miles to tour both of Caleb’s January greenhouses and taste his fresh greenhouse vegetables. As a free bonus, each class member will take home at least $30-worth of greenhouse variety seeds from, including:

Broad Windsor Fava beans
Winter Density lettuce
Michihili Chinese cabbage
Komatsuna winter salad greens
Cascadia Peas
Chioggia beets
America Spinach & more!

Caleb Warnock is the nation’s leading expert in winter gardening, and author of the #1
national bestselling book “Backyard Winter Gardening.” He is also the author of “Forgotten
Skills of Self-Sufficiency Used by the Mormon Pioneers”, “The Art of Baking with Natural Yeast”,
and the owner of Watch a video tour of Caleb’s January winter garden and greenhouse by typing “youtube Caleb Warnock” into google -- see you in class!


  1. Caleb, I am having a wonderful experience growing food in the five hotbed gardens that I built after your inspiring Mapleton class a few months ago. Thank you for getting me started. I was hoping to attend the January 31st class but cannot. Are you considering teaching another class on a a different date? I would love to tour your new $500 greenhouse as well as the $6,000 geothermal greenhouse. Are individual appointments possible if another class is not? Thanks again for your inspiration.

  2. I am excited to hear about your less expensive geothermal greenhouse. For those of us who don't live nearby, will you be sharing how to build one? I'd be more than happy to buy a book, ebook, or plans for such a greenhouse!

  3. This is an incredibly exciting project, and you should be very proud of yourself. We should all do as much as we can to help the environment, and food grown without chemicals always tastes better. I currently have a similar project I'm doing in Liverpool, England, but I'm sure I could learn something by attending one of your classes.

    Refugia Stein @ Container Domes

  4. I just bought your Backyard Winter Gardening and the Pioneer book. Where do I find a list of the winter seeds you talk about in your book. I am interested in your seeds.
    Also, we just moved from Farmington, UT, to the peninsula west of Seattle. The weather is different here. We had about 4 nights at 31 degrees. The weather just does not get cold like UT. Can I plant seeds in my garden and just have them grow in this climate rather than build a cold frame? We have build an above ground vegetable box (36" high) and will plant tomatoes and others starts tomorrow. Thank you for the books. I have loved the Winter one.
    Richard Merrell