Best Smart Lock for Back Door
Your back door is often the most vulnerable entry point. We have analyzed the best smart locks designed specifically for rear doors, focusing on weather resistance, ease of retrofit, and reliable remote access.
Quick answer
The Yale Assure Lock 2 with Wi-Fi is the best overall smart lock for a back door due to its rugged weather rating, easy retrofit installation, and reliable remote access. For a budget-friendly option, the August Wi-Fi Smart Lock (4th Gen) offers excellent compatibility and a simple install.
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Research updated June 2026.
Yale Assure Lock 2 with Wi-Fi
Weather-resistant, easy to install, and works with most smart home platforms.
| Product | Best for | Key Spec | Rating | Price |
|---|---|---|---|---|
| Yale Assure Lock 2 | Overall | IP65, Wi-Fi | 4.6/5 | $$ |
| August Wi-Fi (4th Gen) | Budget | Works with existing key | 4.4/5 | $ |
| Schlage Encode Plus | Apple Home Key | Built-in Wi-Fi, Home Key | 4.5/5 | $$$ |
| Kwikset Halo Select | Touchscreen | Z-Wave, SmartKey | 4.3/5 | $$ |
| Ring Smart Lock Pro | Ring Ecosystem | Z-Wave, Alexa | 4.2/5 | $ |
Yale Assure Lock 2 with Wi-Fi
Best OverallPros
- IP65 weather rating ideal for back doors
- Works with Alexa, Google, Apple Home
- Easy retrofit, no new deadbolt needed
Cons
- Wi-Fi module can drain battery faster
- Keypad can be tricky in direct sunlight
The Yale Assure Lock 2 is our top pick for a back door because of its IP65 weather resistance. Owner reviews on Amazon and Home Depot consistently praise its reliability in rain and snow, which is critical for a rear entry that may not have a covered porch. The lock retrofits onto your existing deadbolt, so you don't need to replace the entire latch mechanism.
Connectivity is solid with built-in Wi-Fi, eliminating the need for a separate hub. The Yale Access app is straightforward, and the lock integrates with all major smart home platforms. Battery life is rated at 6-8 months, though heavy Wi-Fi use can shorten that. Overall, it is a dependable, weather-ready smart lock for any back door.
August Wi-Fi Smart Lock (4th Gen)
Best BudgetPros
- Very easy DIY installation
- Works with your existing key and deadbolt
- Auto-unlock feature works well
Cons
- No weather rating; not for exposed doors
- Bulky design can interfere with some door handles
The August Wi-Fi Smart Lock is a great budget option for a back door that is under cover. It retrofits over your existing thumb turn, meaning you keep your original key and deadbolt. Installation takes about 10 minutes, and the app guides you through the process. Owner reviews highlight the convenience of auto-unlock, which uses your phone's location to unlock the door as you approach.
The main downside is the lack of an official weather rating, so it is best for a covered back porch or mudroom. The unit is also somewhat bulky, and some users report it can rub against adjacent door handles. Battery life is shorter than the Yale, averaging 3-6 months. For the price, it is a solid performer for protected rear entries.
Schlage Encode Plus
Best for Apple Home KeyPros
- Built-in Wi-Fi, no hub needed
- Apple Home Key support for tap-to-unlock
- Robust build quality and weather resistance
Cons
- Requires replacing the entire deadbolt
- Higher price point
The Schlage Encode Plus is a premium smart lock that excels for Apple users. It supports Apple Home Key, allowing you to unlock your back door by tapping your iPhone or Apple Watch. The lock has an IP65 weather rating, making it suitable for exposed rear doors. Owner reviews on Amazon and Best Buy commend its sturdy metal construction and reliable Wi-Fi connection.
The main trade-off is that it requires replacing your existing deadbolt, which adds to installation time. The lock is also more expensive than most competitors. However, for those deeply integrated into the Apple ecosystem, the convenience of Home Key and the robust build quality justify the cost. Battery life is excellent, often lasting up to a year.
Kwikset Halo Select
Best TouchscreenPros
- Touchscreen keypad is responsive and sleek
- SmartKey technology for easy re-keying
- Weather-resistant design
Cons
- Requires a Z-Wave hub for remote access
- No built-in Wi-Fi
The Kwikset Halo Select is a solid choice for those who prefer a touchscreen interface. The keypad is responsive and features a sleek design that looks modern on any back door. It has an IP65 weather rating, so it can handle rain and snow. Owner reviews highlight the ease of re-keying with Kwikset's SmartKey system, allowing you to use your existing key if you already have Kwikset locks.
The main limitation is that it uses Z-Wave, which means you need a separate hub like SmartThings or Ring Alarm for remote access and smart home integration. It does not have built-in Wi-Fi. This adds cost and complexity. For users already invested in a Z-Wave ecosystem, it is a reliable and feature-rich option.
Ring Smart Lock Pro
Best for Ring EcosystemPros
- Seamless integration with Ring Alarm and Alexa
- Easy retrofit installation
- Works with existing key and deadbolt
Cons
- Requires Ring Alarm hub for remote access
- No official weather rating
The Ring Smart Lock Pro is the perfect companion for existing Ring Alarm users. It integrates directly with the Ring app, allowing you to arm/disarm your alarm and lock/unlock your back door from one interface. It also works with Alexa for voice control. Installation is simple as it retrofits over your existing thumb turn. Owner reviews appreciate the convenience of the Ring ecosystem.
The downside is that it requires the Ring Alarm hub for remote access and smart features. It also lacks an official weather rating, so it is best for a covered back door. Battery life is average at 4-6 months. If you are not in the Ring ecosystem, there are better standalone options. For Ring users, it is the most cohesive choice.
What to check before buying a smart lock for your back door
Choosing a smart lock for a back door requires different considerations than a front door. The back door is often more exposed to the elements and may have different door prep. Here are key factors to evaluate.
Weather resistance. Look for an IP65 rating or higher if your back door is exposed to rain or snow. The Yale Assure Lock 2 and Schlage Encode Plus both have this rating. The August and Ring locks lack an official rating, so they are best for covered locations.
Retrofit vs. full replacement. Retrofit locks like the August and Ring fit over your existing thumb turn, making installation quick. Full replacement locks like the Schlage require you to swap out the entire deadbolt. Consider your DIY comfort level.
Connectivity and hub requirements. Some locks have built-in Wi-Fi, while others need a separate hub. Built-in Wi-Fi is simpler but can drain batteries faster. Z-Wave locks like the Kwikset Halo Select require a hub but offer better range and reliability.
Smart home ecosystem. Ensure the lock works with your existing smart home platform. Yale works with all major platforms. Schlage is best for Apple Home. Ring is best for Alexa and Ring Alarm.
Mistakes to avoid when buying a back door smart lock
Many buyers make these common errors. Avoid them to ensure a smooth installation and reliable operation.
Ignoring door thickness. Some smart locks only fit doors of a certain thickness. Measure your back door before buying. Most locks fit standard 1-3/8 to 1-3/4 inch doors, but always check the specs.
Forgetting about the weather. Installing a lock without a weather rating on an exposed back door can lead to failure. Moisture can damage electronics and cause the lock to jam. Always choose a lock with an IP65 rating for exposed doors.
Not checking deadbolt alignment. Smart locks require a properly aligned deadbolt. If your deadbolt is misaligned, the lock may struggle to latch. Fix any alignment issues before installing a smart lock.
Overlooking battery backup. If the lock loses power, you need a way to get in. Most locks have a physical key override or a 9V battery backup. Ensure your chosen lock has one of these options.
FAQs
Can I use a smart lock on a metal back door?
Yes, but you need to ensure the lock is compatible with the door material. Most smart locks work on metal doors, but you may need a specific mounting kit. Check the manufacturer's specifications.
Do smart locks work in freezing temperatures?
Most smart locks with an IP65 rating can operate in freezing temperatures. The Yale Assure Lock 2 and Schlage Encode Plus are rated for temperatures down to -4 degrees Fahrenheit. Battery life may decrease in extreme cold.
Can I keep my existing key with a smart lock?
Yes, retrofit locks like the August and Ring allow you to keep your existing key and deadbolt. Full replacement locks like the Schlage require you to use the new keys that come with the lock.
Do I need a hub for a smart lock?
It depends on the lock. Locks with built-in Wi-Fi, like the Yale Assure Lock 2 and Schlage Encode Plus, do not need a hub. Z-Wave locks, like the Kwikset Halo Select, require a compatible hub for remote access.
How long do smart lock batteries last?
Battery life varies from 3 to 12 months depending on usage and connectivity. Wi-Fi locks tend to drain batteries faster than Z-Wave or Bluetooth-only locks. The Schlage Encode Plus has the longest battery life on our list.
Can I install a smart lock myself?
Yes, most smart locks are designed for DIY installation. Retrofit locks are the easiest, taking about 10 minutes. Full replacement locks take longer and require basic tools like a screwdriver.
Are smart locks secure?
Yes, smart locks use encryption and secure protocols. They are generally as secure as traditional deadbolts. Always use a strong Wi-Fi password and enable two-factor authentication on the app.
What if the Wi-Fi goes out?
Most smart locks still work with a physical key or keypad. Some also have a 9V battery backup. You can still lock and unlock manually even without Wi-Fi.
Can I use a smart lock with a smart doorbell?
Yes, many smart locks integrate with smart doorbells. The Ring Smart Lock Pro works seamlessly with Ring doorbells. Yale and Schlage locks also integrate with various smart doorbell brands through Alexa or Google Home.
Do smart locks work with glass doors?
Yes, but installation may be more complex. Glass doors often have different framing and may require a specific adapter. Check the manufacturer's compatibility before purchasing.
Our verdict
The Yale Assure Lock 2 with Wi-Fi is our best overall smart lock for a back door, offering the best combination of weather resistance, easy installation, and broad smart home compatibility. For a budget-friendly option, the August Wi-Fi Smart Lock (4th Gen) is an excellent choice for covered back doors, providing a simple retrofit and reliable auto-unlock.