February routinely shows up as a trough on the southwest border. The drop is not an anomaly. It is a predictable, seasonal pause driven by weather, logistics, and criminal network timing — and it matters because adversaries and legitimate flows both rebound in predictable ways.
Look at the data. In February 2023 Border Patrol encounters between ports of entry on the southwest border totaled 128,877, roughly even with January that year and described by CBP as “the lowest month of Border Patrol encounters since February 2021.” One month later encounters jumped substantially, with CBP reporting a nearly 23 percent increase in combined southwest border encounters for March 2023. Those month-to-month shifts are not one-off headlines. They are the textbook seasonal swing analysts track.
Why February? Cold snaps, higher water in river sectors, and rough terrain make some crossing routes less tenable and raise risk for the people-smuggling business model. Smugglers factor seasonality into their planning. They slow operations in hard weather and aim to move larger groups once temperatures rise and daylight lengthens. The academic and operational literature shows monthly apprehension series have a late-winter low followed by a spring climb that peaks through May or June in many years. Treat February as a pause, not a solution.
Policy actions and bilateral enforcement can amplify or blunt those seasonal swings, but they rarely erase them. Temporary measures, processing changes, or targeted removals change the composition of encounters and timing, but seasonal drivers persist. That means operational leaders who read February numbers as an all-clear risk being surprised in March and April. CBP public updates and the agency’s southwest land border dashboard remain the canonical sources for month-to-month operational totals and sector detail.
Operational implications are straightforward. First, resource posture must be elastic. Staffing, detention capacity, medical support, and transportation planning should be sized for the spring rebound, not the February trough. Second, situational awareness must include sector-level shifts. In recent seasons crossings moved between sectors as routes and enforcement pressure changed; that tactical agility is how criminal networks preserve throughput. Third, interagency and international coordination must be staged in advance so that surge policies can be executed without the lag that costs days or weeks of unmanaged flow.
From a threat-management perspective the seasonal rhythm creates windows of risk. Criminal networks exploit the lull to reposition loads and reconnaissance teams, and they exploit the rebound to move larger, more lucrative loads when conditions improve. That behavior undercuts any assumption that a low February equals sustained reduction in threat. The correct posture is anticipatory: assume the lull precedes a surge and plan capacity, interdiction, and humanitarian response accordingly.
Bottom line: February lows are real and they are useful intelligence. Use them to prepare, not to declare victory. Analysts and operational commanders who treat February as a strategic endpoint will be caught flat-footed when the seasonal rebound arrives. The smarter approach is surgical readiness calibrated to known seasonal dynamics, cross-sector indicators, and the hard data in CBP’s monthly and sector-level reports.