Best GMC Dealerships in Colorado, Ranked by CarEdge Data
Key Takeaways
- Top 8 GMC dealers in Colorado, ranked using verified out-the-door quotes — not Google star ratings.
- Transwest Gmc Isuzu (Henderson) is the highest-graded GMC dealer in Colorado.
- Autonation Buick Gmc West (Golden) carries the main watch-out — add-ons appear on 100% of verified quotes, averaging $920 — the highest rate here.
- Get an OTD quote in writing before you visit any dealer. CarEdge tracks real prices, not advertised ones.
This is the CarEdge Dealer Transparency Index ranking for GMC dealers across Colorado. We grade dealers using verified out-the-door quotes — real PDFs, emails, and signed deals — not Google star ratings.
We graded every GMC dealer in Colorado with enough verified out-the-door quotes to score with confidence. If you’re shopping a specific metro, jump to the city-by-city rankings below for a tighter local shortlist.
About the CarEdge Dealer Transparency Index
Most dealer rankings come from Google star ratings and Yelp reviews — easy to game, impossible to verify. The CarEdge Dealer Transparency Index is different. We score every dealer using verified out-the-door quotes: real PDFs, emails, and screenshots from actual transactions.
Each dealer’s transparency score (out of 100) is weighted across four dimensions:
- Fee Transparency (30%) — Is the doc fee reasonable compared to the state average?
- Add-on Behavior (30%) — How often does the dealer bundle add-ons, and at what cost?
- Price Accuracy (30%) — Does the listing price match the actual OTD price?
- Data Quality (10%) — More verified quotes mean higher confidence in the grade.
Grades: A (90–100), B (80–89), C (70–79), D (60–69), F (below 60).
Top 8 GMC Dealers in Colorado
Ranked by CarEdge transparency score, highest to lowest. Each dealer profile links to the full review with verified out-the-door quotes.
#1 — Transwest Gmc Isuzu
Grade: A · Score: 100/100 · Henderson, CO
Transwest Gmc Isuzu is the top-graded GMC dealer in Colorado by verified data — A grade, 100/100, based on 12 verified OTD quotes.
- Doc fee: $595 — below the CO average of $643
- Add-ons: None detected in verified quotes
- Listing accuracy: 4.3% below the advertised listing
- Verified quotes: 12
See full review & verified quotes →
#2 — Loveland Buick Gmc
Grade: A · Score: 95/100 · Loveland, CO
Loveland Buick Gmc quoted prices 13.0% below the advertised listing — the kind of discount that rewards getting the OTD in writing.
- Doc fee: $694 — above the CO average of $643
- Add-ons: 20% of quotes, avg $119
- Listing accuracy: 13.0% below the advertised listing
- Verified quotes: 5
See full review & verified quotes →
#3 — Alpine Buick Gmc
Grade: B · Score: 87/100 · Highlands Ranch, CO
Alpine Buick Gmc holds the B grade across 24 verified OTD quotes — a substantial sample size.
- Doc fee: $202 — well below the CO average of $643
- Add-ons: 33% of quotes, avg $385
- Listing accuracy: 2.6% below the advertised listing
- Verified quotes: 24
See full review & verified quotes →
#4 — Mike Maroone Gmc
Grade: B · Score: 84/100 · Boulder, CO
Mike Maroone Gmc quotes prices within 0.0% of the advertised listing — one of the cleanest pricing patterns on this list.
- Doc fee: $0 — well below the CO average of $643
- Add-ons: 33% of quotes, avg $499
- Listing accuracy: Quoted price matches the advertised listing
- Verified quotes: 6
See full review & verified quotes →
#5 — Castle Rock Chevrolet Gmc
Grade: B · Score: 80/100 · Castle Rock, CO
Castle Rock Chevrolet Gmc earns a solid B on verified data — solid fundamentals. The one watch-out: add-ons show on 83% of quotes (avg $333).
- Doc fee: $799 — well above the CO average of $643
- Add-ons: 83% of quotes, avg $333
- Listing accuracy: 2.8% below the advertised listing
- Verified quotes: 6
See full review & verified quotes →
#6 — Shortline Buick Gmc
Grade: C · Score: 78/100 · Aurora, CO
Shortline Buick Gmc grades a C — add-ons appear on 83% of verified quotes, averaging $1,493. Ask for an itemized OTD before signing.
- Doc fee: $789 — well above the CO average of $643
- Add-ons: 83% of quotes, avg $1,493
- Listing accuracy: 1.9% below the advertised listing
- Verified quotes: 6
See full review & verified quotes →
#7 — Autonation Buick Gmc Park Meadows
Grade: C · Score: 77/100 · Lone Tree, CO
Autonation Buick Gmc Park Meadows grades a C — add-ons appear on 83% of verified quotes, averaging $749. Ask for an itemized OTD before signing.
- Doc fee: $799 — well above the CO average of $643
- Add-ons: 83% of quotes, avg $749
- Listing accuracy: 1.8% above the advertised listing
- Verified quotes: 6
See full review & verified quotes →
#8 — Autonation Buick Gmc West
Grade: C · Score: 73/100 · Golden, CO
Autonation Buick Gmc West grades a C — add-ons appear on 100% of verified quotes, averaging $920. Ask for an itemized OTD before signing.
- Doc fee: $685 — above the CO average of $643
- Add-ons: 100% of quotes, avg $920
- Listing accuracy: 0.8% below the advertised listing
- Verified quotes: 7
See full review & verified quotes →
GMC Dealers by Metro in Colorado
Shopping a specific city? These metro-level rankings drill into GMC dealers near each major Colorado market:
Colorado GMC Dealer Rankings at a Glance
| # | Dealer | City | Grade | Score | Doc Fee | Add-Ons | Quotes |
|---|---|---|---|---|---|---|---|
| 1 | Transwest Gmc Isuzu | Henderson | A | 100 | $595 | $0 | 12 |
| 2 | Loveland Buick Gmc | Loveland | A | 95 | $694 | $119 | 5 |
| 3 | Alpine Buick Gmc | Highlands Ranch | B | 87 | $202 | $385 | 24 |
| 4 | Mike Maroone Gmc | Boulder | B | 84 | $0 | $499 | 6 |
| 5 | Castle Rock Chevrolet Gmc | Castle Rock | B | 80 | $799 | $333 | 6 |
| 6 | Shortline Buick Gmc | Aurora | C | 78 | $789 | $1,493 | 6 |
| 7 | Autonation Buick Gmc Park Meadows | Lone Tree | C | 77 | $799 | $749 | 6 |
| 8 | Autonation Buick Gmc West | Golden | C | 73 | $685 | $920 | 7 |
How to Use This Data When You Shop
- Get an OTD quote in writing before you visit. Any dealer can send a worksheet by email — if they won’t, that’s a red flag.
- Ask for a quote with zero add-ons. Everything in the F&I office is optional. Say “please remove all dealer add-ons” and see what the price does.
- Anchor to the OTD, not the listing. Dealers with a gap between advertised price and final OTD aren’t being straight with you. Don’t negotiate off the listing number.
- Compare three dealers minimum. Even within the same metro, doc fees, add-on policies, and listing accuracy vary widely. Use this ranking as your shortlist.
Rankings are generated from the CarEdge Dealer Transparency Index, a public methodology that scores dealers on verified out-the-door quotes — not Google star ratings or paid placements. Data updated quarterly. Last updated: Q3 2026.
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