Colorado Low Cost Spay/Neuter Locations:

State-wide:
Denkai Animal Sanctuary: Northern Colorado 
Spay Colorado

Arapahoe County:
All Cat Clinic - Englewood
Humane Society of The South Platte Valley - Littleton 
Twice Purrfect Feline Rescue - Littleton

Archueleta County:
Humane Society Of Pagosa Springs - Pagosa Spring

Boulder County:
Humane Society Of Boulder Valley Veterinary Clinic - Boulder

Chaffee County:
Ark-Valley Humane Society - Buena Vista

Denver County:
Downtown Animal Care Center - Denver
Dumb Friends League - Mobile Clinic; Denver
The Feline Fix - Denver 
PetAid Colorado: Denver
Planned Pethood Plus - Denver
Max Fund Wellness Center - Denver

El Paso County:
Hamlett Spay and Neuter - Colorado Springs

Fremont County:
Humane Society of Fremont County - Canon City

Garfield County:
Colorado Animal Rescue - Glenwood Springs
Rifle Animal Shelter - Rifle 

Jefferson County:
Cat Care Society - Lakewood
Spay Today - Lakewood
Table Lake - Golden

Larimer County:
Fort Collins Cat Rescue & Spay and Neuter Clinic - Fort Collins 

Mesa County:
Animal Birth Control Grand - Grand Junction

Montezuma County:
For Pets’ Sake Humane Society - Cortez

Montrose County:
Montrose Animal Protection Agency - Montrose

Morgan County:
Fort Morgan Humane Society - Fort Morgan

Otero County:
Peak View Animal Hospital - Fowler

Pitkin County:
Friends of the Aspen Animal Shelter - Aspen 

Pueblo County:
Southern Colorado Spay and Neuter Clinic - Pueblo

Rio Grande County:
SLV Spay and Neuter Alliance - Monte Vista

Routt County:
Routt County Humane Society - Steamboat Springs

Summit County:
League for Animals and People of the Summit (LAPS) - Frisco 

Weld County:
Humane Society Of Weld County - Evans
Every Creature Count - Fort Lupton
Pets of Northern Colorado - Evans