Cross-market view
LME Copper × COMEX Copper: Trading Hours Compared
Joint windows, single-leg hours, and 2026 mismatched holidays for Copper (LME CA) and Copper (COMEX HG), on a typical trading day (UTC).
Latest relevant source check 2026-10-20 · sources on each product page · Verify against official exchange notices before trading
Joint trading windows (typical day)
LME Copper
COMEX Copper
Both open
Both open (UTC): 01:00–19:00
LME Copper
COMEX Copper
Both open
Both open (UTC): 00:00–18:00
Axis is UTC 00:00–24:00 on a Tuesday–Friday day; Monday opens, Friday closes and holiday eves follow each exchange's notice.
Each leg in its own time
| Copper (LME CA) | 01:00–19:00（London time） |
|---|---|
| Copper (COMEX HG) | 17:00 (prev day)–16:00（US Central Time） |
2026 mismatched holidays (one-sided days)
- LME Copper closed, COMEX Copper trading: 15 days · longest stretch 2026-04-03 – 2026-04-06
- COMEX Copper closed, LME Copper trading: 0 days
FAQ
- When are LME Copper and COMEX Copper open at the same time?
- On a typical trading day (UTC) the joint windows are 01:00–19:00 in winter (00:00–18:00 in summer), about 18h in total.
- Does COMEX Copper keep trading while LME Copper is closed?
- Yes — on 15 trading days in 2026 LME Copper is closed while COMEX Copper trades, the longest stretch being 2026-04-03 – 2026-04-06. These are one-sided exposure windows for cross-market positions.
- Does daylight saving change the LME Copper–COMEX Copper overlap?
- The joint windows differ between the two seasonal scenarios. See the exact endpoints and durations above; they do not necessarily shift by one hour. The two typical scenarios do not represent US/UK transition gaps or temporary exchange schedules. Check dated exchange notices; where a date query is available, check its coverage.