Definition
A curfew is a governmental or legal restriction requiring persons to remain off public streets and in their homes (or another designated location) between specified hours, typically at night. The term also refers to the designated hour at which that restriction begins.
In modern legal usage, curfews appear in two primary contexts:
1. Civil/municipal curfews. Local ordinances imposing time-based restrictions on presence in public spaces, most commonly targeting juveniles. These are standing regulations, not tied to any emergency declaration.
2. Emergency curfews. Temporary restrictions imposed by executive authority—federal, state, or local—during civil disturbances, natural disasters, or other emergencies. Authority derives from statutory emergency powers or martial law frameworks.
Common Language
Modern common usage (Wiktionary): Any regulation requiring people to be off the streets and in their homes by a certain time; also the time at which that restriction begins, or the signal marking it. An older sense—a fireplace accessory for banking embers—survives in historical contexts.
Historical common usage (Webster's 1913): The ringing of an evening bell, originally signaling inhabitants to cover fires and retire; also the bell itself. A utensil for covering a fire (obsolete).
The common meaning of curfew has largely converged with the legal meaning in its modern regulatory sense, but the gap that remains is significant: ordinary usage treats curfew as self-defining (a time-based restriction), while legal usage requires identifying the source of authority, the class of persons restricted, the constitutional framework that applies, and the enforcement mechanism. Calling something a "curfew" in legal analysis says little without knowing whether it is a juvenile ordinance, an emergency order, or a martial law measure—distinctions the common definition does not draw.
Why It Matters in Research
The term carries significantly different legal weight depending on context. A juvenile curfew ordinance is a routine exercise of municipal police power subject to constitutional scrutiny (typically First and Fourteenth Amendment challenges); an emergency curfew may invoke emergency powers statutes, executive orders, or martial law doctrine and operates under a different analytical framework entirely.
Researchers working with historical sources should be alert to the term's evolution. Before the twentieth century, "curfew" in legal texts almost always referred to the historical Norman institution—a background fact, not a live legal instrument. Municipal curfew ordinances proliferated in the late nineteenth and early twentieth centuries, initially targeting adults and later narrowing to minors. Emergency curfews gained renewed prominence mid-twentieth century (World War II curfew orders directed at Japanese Americans are a critical chapter in constitutional history) and again during urban civil disturbances of the 1960s and beyond.
Constitutional doctrine around curfews is unsettled and jurisdiction-specific. Courts have applied varying levels of scrutiny—strict scrutiny, intermediate scrutiny, and rational basis—depending on whether the curfew burdens a fundamental right, targets a suspect class, or restricts minors versus adults. Researchers should not assume a consistent standard across courts or eras.
When reading older statutes and municipal codes, note that "curfew" sometimes appeared as a colloquial label for bell-ringing ordinances with no movement restriction at all—just a time signal. Those are descriptively curfews in the original sense but carry no modern legal meaning.
Cross-reference with emergency powers doctrine, martial law, and police power entries when tracing the authority basis for any particular curfew.
Historical Dictionary Support
Both Black's editions treat curfew almost entirely as a historical artifact. The second edition provides the fullest account: the institution is attributed to William the Conqueror, requiring inhabitants to extinguish fires and lights and disperse at the ringing of a bell at eight o'clock. The derivation offered in Black's 2nd connects the word to the French (couvre-feu, "cover fire"), a point consistent with Webster's 1913.
What both editions miss entirely is the term's modern legal life. Neither Black's entry anticipates the curfew as an active regulatory instrument—as a municipal ordinance, an emergency order, or a constitutional flashpoint. For a mid-century or later legal researcher, the historical dictionaries are useful for etymology and feudal context but offer nothing on constitutional doctrine, enabling legislation, or enforcement mechanics.
Webster's 1913 is similarly rooted in historical and literary usage, reflecting the era when "curfew" was still primarily encountered as a cultural or poetic reference (Shakespeare, Campbell) rather than as a live legal term. Webster's does note the broader modern sense—"any regulation requiring people to be off the streets"—but without legal elaboration.
The gap between the historical dictionaries and modern legal practice is substantial. Researchers relying solely on Black's for this term will find historical background but must look elsewhere for the constitutional and statutory framework that governs curfews as currently litigated.
Jurisdictional Note
Municipal juvenile curfew ordinances vary widely by state, including in their enabling legislation, the age thresholds used, and permitted exceptions (employment, religious activity, supervised events). Some states preempt local curfew authority or require state legislative authorization before municipalities may act. Emergency curfew authority is similarly fragmented, deriving from state emergency management statutes, gubernatorial emergency powers, or local home-rule authority depending on the jurisdiction.