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Recipe · under 300 ft

Under 300 ft: bury Cat6 to the barn

For a barn, shop or cabin close enough to dig to. One cable, full speed, nothing to aim, and done right it lasts decades.

Quick answer

Yes, you can bury Cat6, as long as it’s cable sold for direct burial and the whole run stays under 328 ft including bends. Put it in conduit if you can. Put a surge protector where it enters each building. Call 811 before you dig.

Prices checked Research-based, not tested on a farmWorks with any internet provider at the house.

Reach
≤ 328 ft total cable
Main part
Direct-burial spool, $149.99 (500 ft)
Digging
Yes, the whole route
Electrician
For bonding, if unsure
House to barn, ≤ 300 FT: Direct-burial Cat6, in conduit or notA buried Cat6 run from the house to the barn, with a surge protector (SP) where the cable enters each building.HOUSErouter / ISPBARN≤ 300 FTSPSPCAT6 · ≤ 328 FT INCL. BENDS · SP = SURGE PROTECTOR
A buried Cat6 run from the house to the barn, with a surge protector (SP) where the cable enters each building.

Before you start

  • Measure the route, not the straight line. Add about 10% for bends and 10 ft of slack at each end. If that’s over 328 ft, use fiber or a bridge instead.
  • Call 811 a few business days before you dig. It’s free, and utilities mark their buried lines.
  • Know where each building’s grounding electrode is. The surge protectors bond to it.
  • Decide what runs at the far end. A switch, an access point, cameras. If there’s no outlet there, plan on PoE.

Conduit or direct burial?

Two ways to bury the same cable
In conduitDirect burial
CableDirect-burial Cat6 (still the right cable: conduit fills with water)Direct-burial Cat6, gel-filled or water-blocked
Replace laterPull a new cable throughDig it up
Rodents, shovelsProtectedExposed
Extra cost for 200 ft≈ 22 sticks × $9.53–$10.75None
Pick it whenYou’ll ever add fiber or a second cableBudget is tight and the route is marked

Steps

  1. Test the cable on the spool. Put a connector on each end and run a cable tester before anything goes in the ground. A bad spool is cheap to return; a buried one isn’t.
  2. Dig the trench. Hand-dig short runs; rent a walk-behind trencher for longer ones. Depth: ask your inspector (see the FAQ for what one maker suggests).
  3. Lay conduit (if using it) with sweeping elbows where it turns up into each building. Leave a pull string inside.
  4. Pull or lay the cable. Leave a 10 ft loop at each end. Don’t kink it or step on it.
  5. Enter each building and fit a surge protector where the cable comes in. Bond it to that building’s grounding electrode with a short wire.
  6. Terminate and test again before you backfill. Then backfill, and mark the route on a sketch you keep.
  7. Plug in. House end to the router (or a switch); far end to a switch, access point or a PoE device.

Parts for a 200 ft run

Example: barn 200 ft from the house, can dig, Wi-Fi wanted in the barn. Cable route ≈ 241 ft. Use the planner for your own numbers.

Buried Cat6 in conduit, 200 ft

PartQtyCost
Direct-burial Cat6, 500 ft spoolRoute ≈ 241 fte.g. Voltive V-1236-1 Cat6 Direct Burial Gel Filled, 500 ft1 × 500 ft spool$149.99Oct 5, 2026
1 in. Schedule 40 PVC conduit10 ft sticks + 2 sparee.g. JM Eagle 1 in. x 10 ft PVC Sch 40 Conduit 67462; Cantex 1 in. x 10 ft Sch 40 PVC Conduit22 × 10 ft stick$209.66–$236.50Oct 5, 2026
Outdoor Ethernet surge protectorOne at each buildinge.g. ETH-SP-G2; ETH-SP-G22 × each$23.38–$28.28Oct 5, 2026
Termination kit: shielded RJ45 plugs, crimper, cable testerSkip if you own theme.g. FS.com shielded pass-through RJ45 (50); Klein VDV226-011 crimper1 × kit (bought separately)$114.96–$199.43Oct 5, 2026
Outdoor Wi-Fi access pointWi-Fi in or around the barne.g. TP-Link EAP225-Outdoor; TP-Link EAP610-Outdoor1 × each$69.95–$219Oct 5, 2026
Walk-behind trencher rental (optional)Or dig by hand1 × per dayprice not checked
Parts total$568–$833

US retail prices before tax and shipping. Optional lines aren’t in the total. Sources: how we price parts.

What happens after

Once it tests good, you’re done: buried Cat6 has nothing to maintain. Keep your route sketch with the property papers. After a close lightning strike, check the surge protectors and the devices at both ends (after-storm list).

Common reasons it fails

  • The run is over 328 ft. Link drops or won’t come up at gigabit. Fix.
  • Wrong cable in the ground. Works for months, then errors and drops when it gets wet. Fix.
  • Surge with no protection. Switch ports or a camera die after a storm. Fix.
  • A bad crimp. Fixed by re-terminating and testing.

When this is the wrong choice

  • The route is over about 300 ft door to door: use fiber (same trench, no length problem) or a bridge.
  • You can’t dig (rock, a driveway, a creek): use a bridge.
  • The building gets a lot of lightning and you’d rather not bond anything: fiber has no metal path at all.

Questions people ask

Conduit or just bury it?

Conduit if you can afford it: you can pull a new cable later without digging, and it protects against rodents and shovels. Direct burial is cheaper and fine if you use gel-filled direct-burial cable and mark the route.

How deep do I bury Ethernet cable?

No source we read settles a code depth for low-voltage data cable, so ask your local inspector. One cable maker (trueCABLE) suggests 18–24 in without conduit and 8–10 in inside conduit. That’s a maker’s advice, not code. Always call 811 first.

Can I use regular outdoor Cat6 underground?

No. Outdoor (CMX/UV) cable is made for sun, not for sitting in wet soil. Buy cable sold as direct burial: it has water-blocking gel or tape so moisture can’t creep along the wires.

Can I power a camera or access point at the barn over the cable?

Yes, with PoE. A PoE+ injector at the house sends up to 25.5 W to the device at the far end, within the same 328 ft limit.

Sources

  1. Category 6 cable - Wikipedia (secondary), checked Oct 5, 2026
  2. trueCABLE Cat6 Direct Burial Ethernet Cable Unshielded, checked Oct 5, 2026
  3. trueCABLE: A Guide to Cat6A Unshielded Direct Burial Ethernet Cable, checked Oct 5, 2026
  4. 811 Before You Dig (Common Ground Alliance), checked Oct 5, 2026
  5. Ubiquiti ETH-SP-G2 Quick Start Guide, checked Oct 5, 2026
  6. UpCodes: NEC 800.100 Cable and Primary Protector Bonding and Grounding (secondary), read in search results, checked Oct 5, 2026
  7. Power over Ethernet - Wikipedia (secondary), checked Oct 5, 2026
  8. Voltive V-1236-1 Cat6 Direct Burial Gel Filled, 500 ft (secondary), checked Oct 5, 2026
  9. trueCABLE Cat6 Gel Filled Direct Burial, unshielded, 1000 ft (secondary), checked Oct 5, 2026
  10. Voltive V-1236-2 Cat6 Direct Burial Gel Filled, 1000 ft (secondary), checked Oct 5, 2026
  11. Monoprice Cat6 Outdoor Gel-filled Direct Burial, 1000 ft (p_id 15398) (secondary), read in search results, checked Oct 5, 2026
  12. JM Eagle 1 in. x 10 ft PVC Sch 40 Conduit 67462 (secondary), read in search results, checked Oct 5, 2026
  13. Cantex 1 in. x 10 ft Sch 40 PVC Conduit (secondary), read in search results, checked Oct 5, 2026
  14. ETH-SP-G2 (secondary), checked Oct 5, 2026
  15. ETH-SP-G2 (secondary), read in search results, checked Oct 5, 2026
  16. FS.com Cat6 shielded pass-through RJ45, 50/pack (144309) (secondary), read in search results, checked Oct 5, 2026
  17. Infinite Cables Cat6 pass-through shielded plug, 50-pack (secondary), read in search results, checked Oct 5, 2026
  18. Triplett CAT6-HSPS-FP shielded pass-thru, 50-pack (secondary), read in search results, checked Oct 5, 2026
  19. Klein Tools VDV226-011-SEN ratcheting crimper (secondary), read in search results, checked Oct 5, 2026
  20. Klein Tools VDV226-110 pass-thru crimper (secondary), read in search results, checked Oct 5, 2026
  21. Klein Tools VDV526-200 LAN Scout Jr. 2 (secondary), read in search results, checked Oct 5, 2026
  22. Klein Tools VDV501-851 Scout Pro 3 kit (secondary), read in search results, checked Oct 5, 2026
  23. TP-Link TL-POE160S (secondary), read in search results, checked Oct 5, 2026
  24. TP-Link TL-POE160S (secondary), read in search results, checked Oct 5, 2026

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