Castaic's I-5 Widening: What Commuters Should Know

Published by Michelle & Jon Dubner | Dubner Real Estate Group | Equity Union

The commute question comes up in almost every conversation Jon and I have with buyers considering Castaic, California, and there is real news on that front. Metro and Caltrans are in the middle of a major widening project on I-5 between Newhall Pass and Castaic, and it is worth understanding before you decide how a Castaic commute will actually feel.

Key Takeaways

• Metro and Caltrans are widening I-5 from Newhall Pass to Castaic, adding an HOV lane each direction plus truck lanes and soundwalls.
• The project ties directly to more than 25,000 new SCV residents projected by 2035.
• Metro's current estimate is spring 2027 completion, later than an earlier 2026 estimate.
• Expect ongoing construction-related delays on this stretch of I-5 until the project wraps.

We put the rest of it together here: the Castaic market page we keep updated.

Metro, in partnership with Caltrans District 7, is widening I-5 from the SR-14 interchange at Newhall Pass to just south of Parker Road in Castaic. The project adds one HOV carpool lane in each direction, along with truck lanes, auxiliary lanes, four new soundwalls, one located north of Calgrove Boulevard, intelligent transportation system upgrades, and a replacement of the Weldon Canyon Bridge.

Metro's stated purpose is addressing congestion tied to projected growth of more than 25,000 new Santa Clarita Valley residents by 2035. Castaic sits at the north end of that growth corridor, and I-5 is the primary route in and out for most commuters, so this project is directly tied to how the whole north SCV is expected to grow.

For Castaic specifically, this matters more than it might for communities closer to the center of the valley. Castaic does not have the same Metrolink access that Canyon Country or Newhall have, so I-5 capacity is not just one option among several, it is the primary commute corridor for most residents heading toward Los Angeles, Burbank, or the rest of the SCV. That is part of why a freeway project this far north carries real weight for Castaic home values and daily quality of life, not just regional traffic statistics.

Construction began in fall 2021 and is currently active. Metro's own project page currently estimates completion in spring 2027. It is worth knowing that an earlier news report from November 2024 had cited a 2026 completion, so the timeline has clearly slipped. We are giving you Metro's current official estimate rather than the older one, and we will update this post if that date moves again.

Active freeway construction typically means ongoing lane shifts, temporary closures, and unpredictable drive times in the corridor closest to the work zone. If you are commuting daily through this stretch of I-5, build in extra time until the project wraps. On the other side of that construction window, Castaic is set to have additional carpool capacity, new soundwalls to reduce freeway noise for nearby neighborhoods, and a safer, wider corridor supporting the growth the whole valley is expecting. For buyers weighing a Castaic commute today against what it will look like once this project is done, that is the real tradeoff to think through.

Jon and I tell buyers to separate two different questions: what the commute feels like today, during active construction, and what it will feel like once the added capacity and soundwalls are in place. If you are buying with a longer time horizon, the freeway improvements are a genuine long-term positive for Castaic, both for daily commute time and for noise reduction in neighborhoods closest to the corridor. If you need to commute through this stretch daily starting immediately, it is worth driving the actual route at your normal commute time before you make an offer, rather than relying on typical drive-time estimates that do not account for current construction conditions. Home proximity to Ridge Route Road, Hasley Canyon Road, and other local access points can meaningfully change how much of the active work zone you experience day to day, and that is exactly the kind of detail Jon and I walk through with every Castaic buyer.

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Michelle & Jon Dubner · Dubner Real Estate Group · Equity Union

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