Best time to cross Otay Mesa: hour by hour from 30 days of CBP data
Median wait at Otay Mesa by hour and day, from CBP over the last 30 days. Lightest window: Saturday 5 to 7 AM at a 10 minute median. The Sunday evening peak to plan around.
Sebastian Becerra · 2026-04-24
Otay Mesa is the second-busiest commercial crossing on the U.S.-Mexico border and the de facto overflow lane for San Ysidro. The 30-day median northbound wait at Otay is 90 minutes, a full 30 minutes lighter than San Ysidro. The cheapest window all week is pre-dawn Saturday: 5, 6 and 7 AM all median 10 minutes, and pooled across all seven days the lightest hour on the clock is 6 AM at 60. The worst window is the Sunday evening return peak, where 7, 8 and 9 PM all median 210 minutes. Saturday evening, by contrast, is mild: 7 PM sits at 60.
What the data shows
Three patterns stand out:
- Saturday pre-dawn is the single cheapest window on the California border. Saturday 1 through 7 AM medians sit between 10 and 13 minutes, and the run at 5, 6 and 7 AM is a flat 10. Friday morning is the runner-up at 20 minutes at 7 AM and 23 at 5 AM. Nothing else at any major California crossing comes close.
- Sunday evening is the worst window of the week, and it is Sunday alone. Sunday 7, 8 and 9 PM all median 210 minutes, with 6 PM at 195 and 4 to 5 PM at 180. This is return traffic flowing back toward San Diego at the end of the weekend. Saturday evening does not do the same thing: Saturday 7 PM medians 60.
- Friday is the lightest day, Tuesday the heaviest, and Wednesday is stranger than either. Day medians run Tuesday 150, Monday 105, Wednesday 103, Sunday 100, Thursday 90, Saturday 53, Friday 50. Tuesday holds a flat 170 from 2 PM to 6 PM. Wednesday is the odd one: it is quiet overnight at 60, then jumps to 210 from 7 to 9 AM and again from noon to 2 PM, a spike shape the other weekdays do not share.
Every cell quoted above rests on at least five observations, and most on eight to twelve. That is enough to trust the shape of the week and the size of the Sunday evening peak. It is not enough to treat any single hour as a guarantee, and Wednesday's spike in particular looks like a small number of bad days rather than a standing pattern.
Compared to San Ysidro
If you have the choice between Otay and San Ysidro on the same day:
- Friday and Saturday: Otay wins outright, and it is not close. Friday day medians run 50 at Otay against 60 at San Ysidro, but the mornings separate hard: Otay 7 AM is 20 minutes against San Ysidro's 40. Saturday is the blowout, with Otay at a 53 day median against San Ysidro's 90, and Otay 5 to 7 AM at 10 minutes against San Ysidro's 50 to 80.
- Sunday evening: San Ysidro is now the better bet, which reverses the old advice. Otay's 7 to 9 PM cells median 210 against San Ysidro's flat 170. Otay is only ahead earlier in the day, where its 9 AM sits at 90 against San Ysidro's 100.
- Tuesday and Wednesday: San Ysidro wins. Otay's Tuesday day median is 150 against San Ysidro's 159, but Otay's afternoon is worse, and Wednesday is the clear flip: Otay 9 AM medians 210 against San Ysidro's 120.
- Monday: Otay wins comfortably. Monday day medians run 105 at Otay against 160 at San Ysidro, and the pre-dawn cells point the same way (Mon 4 AM: Otay 85, San Ysidro 165).
- Pedestrian: San Ysidro has PedWest plus PedEast. Otay has one pedestrian crossing. SY pedestrian is the right answer for foot traffic.
The live Otay Mesa page and San Ysidro page show current waits side by side so you can decide on the day.
SENTRI and Ready Lane at Otay
Otay has a SENTRI lane for Trusted Traveler Program members. The lane is open during operating hours, can move significantly faster than standard during peaks, and uses the same eligibility rules as every other SENTRI port.
SENTRI is a Trusted Traveler Program. Membership requires an application, fee, background check, and in-person interview at an enrollment center. CBP publishes program rules, eligibility, fees, renewal cadence, and the list of approved enrollment centers. Always confirm current rules before applying or renewing.
Source: U.S. Customs and Border Protection
What this means for you
- If you can shift your crossing to Saturday pre-dawn, do. The 1 to 7 AM band medians 10 to 13 minutes, making Otay the lightest crossing on the California border by a wide margin.
- Avoid Sunday evening specifically. 4 PM through 9 PM medians run 180 to 210 minutes. Saturday evening is not the same trap: 5 to 8 PM medians 60 to 65.
- For Sunday return trips: cross before 9 AM, when medians run 50 to 60 minutes, or accept the evening. Once the afternoon starts climbing at 3 PM it does not let go until 11 PM.
- Commercial trucking: Tuesday runs heaviest of the weekdays at a 150 day median and Friday lightest at 50. Plan dispatch accordingly.
How we compute these numbers
The Border Pulse cron pulls the official CBP wait time for Otay Mesa and stores a snapshot. The chart above is the median wait per (day of week, hour of day) cell across the last 30 days of those snapshots. Because a 7 by 24 grid is finer than the refresh cadence can fill, each cell is estimated from a window centred on that hour, widened to at most two hours either side and only as far as it needs to go. Cells that still fall short of five observations are shown as "not enough data" instead of a number. We never pool across days, because the day of week is the pattern. The window is rolling, so these figures move as new snapshots arrive and older ones age out. The numbers quoted on this page were recomputed on July 27, 2026; the live chart above always reflects the current window. We use median, not mean, because a single 200 minute outlier can drag the average without telling you anything about the typical hour. Every number on this page comes from the CBP BWT feed, which is the canonical source.