If you're shopping for an equestrian property in Castle Rock, Colorado, the first number to know is Douglas County's density cap: the county allows one animal unit per half acre, and young animals under 6 months of age don't count toward the limit (Douglas County DCZR Section 24, Animals). How many horses you can keep, whether you can board, and whether you can teach lessons all come down to your zone district, your acreage, and your HOA covenants.
Before you fall in love with a barn and a view, here's the short checklist I run through with every horse buyer:
- Confirm the zone district (ER, RR, LRR, or A-1) and the parcel's exact acreage.
- Do the animal-unit math: one animal unit per half acre.
- Decide if you'll board horses (two by right; three to eight needs administrative review).
- Ask whether you'll teach lessons (RR allows up to 14 non-owned lessons per week by right).
- Check whether you're crossing into commercial use (that triggers a Special Use Review).
- Read the HOA covenants, which can prohibit horses even where the county allows them.
- Verify water, since commercial boarding must prove 20 gallons per horse per day.
How many horses can you keep on Castle Rock acreage?
Douglas County ties horse-keeping to a density formula: one animal unit per half acre (DCZR Section 24, Animals). Hoofed animals, per the code, include horses, cattle, mules, llamas, sheep, goats, and swine, so if you've got a couple of goats out there, they count too.
The practical upside: a young foal under 6 months doesn't count against your limit. But don't plan your herd around the bare minimum. Colorado's semi-arid climate is hard on pasture, and I've watched more than one buyer overstock a small parcel and end up hauling in hay year-round. Run the math on the acreage, not the dream.
Which zone district is the property in?
This is the question I wish more buyers asked before writing an offer. Section 24 organizes horse limits by zone district and acreage band, and the four you'll see most around Castle Rock are ER, RR, LRR, and A-1 (DCZR Section 24 Table of Contents).
The acreage bands
Here's roughly how the county groups them:
- ER (and nonconforming RR/LRR/A-1): 2.3 to 4.49 acres
- RR (and nonconforming A-1/LRR): 4.5 to 8.9 acres
- LRR (and nonconforming A-1): 9 to 34.9 acres
- A-1 Agricultural: the large-acreage tier
Each band carries its own density and boarding limits. A listing that says "horse property" tells you nothing until you know the district and the exact lot size. I always pull the zoning before we tour, so we're not standing in a barn doing guesswork.
Can you board other people's horses?
Boarding is where a lot of folks trip up, because keeping your own horses and boarding someone else's are treated very differently. Under the Douglas County Zoning Resolution, two boarded horses are allowed by right. Three to eight boarded horses may be permitted only through administrative review (DCZR Section 24, Animals).
So if your plan is to bring in a few boarders to help cover the cost of the property (I hear this one a lot), understand that the county wants a say once you pass two horses. It's not a dealbreaker, it's a process. Just budget the time for it.
When does horse keeping become a commercial use?
Once you cross from hobby into business, the rules change again. When the number of boarded horses exceeds what's allowed by right or by administrative review, or when training lessons for non-owned horses exceed 14 per week, the use has to go through a Special Use Review in the A-1, LRR, RR, and ER zones (DCZR Section 21, Use by Special Review).
What the county wants to see
A Special Use Review isn't just paperwork. Applicants have to demonstrate a minimum water supply of 20 gallons per horse per day and show manure storage areas, pasture grazing schedules, and manure disposal on a plan exhibit (DCZR Section 21). If you're eyeing a working boarding or training operation, water is the piece that quietly makes or breaks the plan out here.
Can you teach riding lessons on the property?
Yes, within limits, and it depends on your zone. Under the Rural Residential (RR) District, the county expressly permits "Training of nonowned horses, or riders not related to the landowner or lessee, limited to 14 lessons per week" as a by-right accessory use (DCZR Section 5, RR - Rural Residential District).
That 14-lesson ceiling is the same number that shows up in the commercial trigger. Stay at or under it in RR and you're operating by right. Go over it, and you're back in Special Use Review territory. If a modest lesson program is part of your income plan, know exactly where that line sits.
What does A-1 Agricultural zoning actually mean?
A-1 is the big-acreage standard, described in the code as land "characterized by large-acreage farms, ranches, open areas, farmhouses, units for agricultural workers and their families" (DCZR Section 3, A-1 Agricultural District).
Here's the catch buyers miss: an A-1 parcel smaller than 35 acres is limited to the special-review uses allowed in the residential zone district it conforms to (DCZR Section 3). In other words, the A-1 label alone doesn't unlock full agricultural privileges if the lot is under 35 acres. Read the acreage, not just the zoning label.
What about manure, drainage, and the land itself?
The county cares about what your horses leave behind. Douglas County's planning portal states that in residential zone districts, manure piles must be set back from the lot line per the zone's accessory-use setback rules, animals can't create excessive odor or health hazards, and you must provide adequate drainage so runoff with sediment or organic waste doesn't reach neighboring land (Douglas County Animals, Planning & Development Review, updated March 13, 2024).
The county also warns plainly that grazing on fragile land "in combination with the semi-arid climate may lead to a loss of vegetation, water contamination and erosion problems." That's not just bureaucratic language. I've seen overgrazed parcels turn to bare dirt in a couple of seasons. Rotate your pasture and you protect both your land and your resale value.
Don't forget the HOA
Here's the one that surprises people most. County zoning can allow horses, and your HOA can still say no. HOA covenants can legally override county zoning and prohibit horses entirely. I've had buyers ready to sign on a beautiful acreage lot, only to find the covenants banned livestock outright.
So read the covenants before you get attached. If keeping horses is the whole point of the move, the HOA documents matter as much as the zoning map.
A grounded next step
I've lived in Elbert County for 22 years and spent a long time helping people sort out barns, pasture, water, and zoning across Douglas, El Paso, and Elbert County. The horse-property market out here rewards buyers who do the homework up front. If you're thinking about buying or selling an equestrian property near Castle Rock and want a second set of eyes on the zoning before you commit, give me a call at The Seville Team and we'll walk through it together.