Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Tamara,
I'm so sorry that you won't have access to this pasture -- that is very upsetting for you, indeed!
I have a similar situation with my horses since moving to Colorado. Yes, they can do very well on only hay. However, you'll need to provide hay 24/7 and make certain that it is of good quality.
You may be able to plant some pasture grass, especially soon, before the first snow fall. Go to your local feed store and see what seed they have available that is native to your area. Once the ground is consistently below 50 degrees F, you can throw the seed down and it won't germinate. The snow will cover it all winter, and when spring arrives, it will germinate and you'll have grass! It likely won't be enough to keep them fed without adding hay, but at least it will keep them from standing around the hay feeder all day!
I hope this suggestion helps! You'll still be able to keep them home with you, rather than boarding them, which I know you'd likely prefer!
Keep me posted.
All the best,
Dr. Getty 
Where are you from? Bayfield, Colorado