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  • Fast in-and-out: Most visits take about 15–20 minutes once testing begins.

  • Open late Wednesdays: Perfect for after-work smog checks.

  • Test-only honesty: We don’t sell repairs—just an accurate, fair inspection.

  • DMV e-cert: We transmit results electronically so you can renew right away.

  • Free retest: If you originally tested here and need a retest, we’ve got you.

If you need a smog test, we got you covered.
If you fail a smog test, we got you covered.

Location & Hours — Midnight Smog (San Marcos)

Off Hwy 78 at Las Posas • Easy parking • Open late Wednesdays

Midnight Smog is conveniently located at 1285 Stone Dr, Suite 101, San Marcos, CA 92078 — just off the Hwy 78 / Las Posas exit. Walk in any day, and on Wednesdays we’re open late so you can swing by after work. We perform quick, accurate test-only smog inspections and transmit results to the DMV.

ADDRESS:

1285 Stone Dr, Suite 101, San Marcos, CA 92078

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Phone:

(760) 304-0122

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Hours:

  • Mon, Tue, Thu, Fri, Sat, Sun — 8:00 AM–8:00 PM

  • Wed — 8:00 AM–12:00 AM (midnight)​​​​​​​​

Coming from nearby on the 78 hwy?

Here are some Driving directions:

 

From Hwy 78 (Las Posas exit): Exit Las Posas Rd, head south toward W San Marcos Blvd, turn right on Stone Dr; we’re in Suite 101.


From Vista: Take Hwy 78 east, exit Las Posas, head south toward W San Marcos Blvd, turn right on Stone Dr; we’re in Suite 101.


From Carlsbad/Oceanside: 78 east → Las Posas, head south toward W San Marcos Blvd, turn right on Stone Dr; we’re in Suite 101.


From Escondido: 78 west → Las Posas, head south toward W San Marcos Blvd, turn right on Stone Dr; we’re in Suite 101.

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Parking: Customer parking is directly in front of Suite 101.


Accessibility: Ground-level entrance. 

San Marcos • Vista • Carlsbad • Oceanside • Escondido • North County San Diego

Midnight Smog
1285 Stone Dr Suite 101
San Marcos, CA 92078
(760) 304-0122
Open 7 days • Open late Wednesday

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Hours: Mon 8am–8pm • Tue 8am–8pm • Wed 8am–12am (midnight) • Thu 8am–8pm • Fri 8am–8pm • Sat 8am–8pm • Sun 8am–8pm


Serving San Marcos, Vista, Carlsbad, Oceanside, and North County San Diego.
© 2025 Midnight Smog. All rights reserved.
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