Gatlinburg, TN → Key West, FL

Your journey from the Great Smoky Mountains to the southernmost point of the continental United States spans roughly 1,011 miles and will take you approximately 16 hours and 57 minutes of driving time. You'll begin by heading south from Gatlinburg on US-441, descending through Tennessee's rolling foothills before connecting to I-75 South near Knoxville. This interstate becomes your primary corridor for the next several hundred miles, carrying you through the heart of the Southeast as you pass through Georgia and into Florida. Eventually, you'll transition to US-27 South and then the Overseas Highway (US-1), which strings together the Florida Keys like a necklace across turquoise waters—a dramatic shift from the mountain terrain where you started.

The landscape transformations along this route are remarkable and continuous. You'll leave behind the Smoky Mountains' elevation and dense forests, descending into Georgia's gentler piedmont region before entering Florida's flat, subtropical terrain around Jacksonville. The drive through central Florida features long stretches of relatively uniform landscape—pine forests, lakes, and agricultural areas—with minimal elevation change. However, once you reach the Keys and transition onto the Overseas Highway, the geography becomes truly unique, with ocean views on both sides and small islands connected by bridges replacing traditional roadways.

Notable cities punctuate your route and offer excellent stopping points: Knoxville, Atlanta, Jacksonville, and then smaller Keys communities like Marathon and Key Largo as you approach your destination. The urban stretches around Atlanta and Jacksonville require more attentive driving, while much of central Florida and the Keys offer more relaxed, scenic driving conditions. You'll experience a shift from congested interstate driving to the slower-paced, almost tropical feel of the final hours as you island-hop toward Key West.

The best time for this drive is late fall through early spring, when Florida's temperatures are mild and the humidity is manageable. Summer driving brings intense heat and afternoon thunderstorms, particularly in Florida, while the Keys can experience rough conditions during hurricane season from June through November. Spring offers pleasant weather and minimal crowds on the Overseas Highway, making it an ideal time for this spectacular American journey.

The 1011-mile drive from Gatlinburg, Tennessee to Key West, Florida takes approximately 16h 57m under normal conditions. Weather along this route can vary significantly, especially across varying terrain where weather conditions can change rapidly. Route Outlook helps you find the safest time to travel by showing you weather conditions at every point along your route, timed to when you'll actually be there.

Common Weather Hazards on This Route

• Severe thunderstorms and flash flooding (spring and summer)
• Hurricane and tropical storm impacts (June through November)

Seasonal Driving Considerations

Weather along this route varies by season. Winter months can bring snow, ice, and reduced visibility, while summer may see thunderstorms, heat-related road issues, or construction zones. Spring and fall generally offer the most comfortable driving conditions but can still surprise with sudden weather changes. Regardless of season, checking real-time conditions along your entire route before departing can help you avoid the worst of it.

Best Time to Drive Gatlinburg to Key West

For long drives like this 1011-mile journey, planning is essential. Consider breaking the trip into segments if weather looks challenging. The best approach is to check conditions for multiple departure times using Route Outlook's optimizer, which considers weather at each point when you'll actually be there.

Driving Strategy

Covering 1011 miles from Gatlinburg to Key West is a full-day or multi-day drive that requires advance planning. Break the route into manageable segments, planning fuel and rest stops every 2-3 hours. Weather that looks fine at departure may deteriorate significantly at the midpoint. Consider booking overnight accommodation if the forecast shows deteriorating conditions in the latter half. Route Outlook's segment-level weather data helps you identify exactly where and when conditions will change.

Frequently Asked Questions