NG historical data: 1-minute to daily bars, 2008 to 2026

NG is the Henry Hub natural gas futures; it tracks Henry Hub natural gas. MarketParquet holds NG as a futures contract with 1-minute, 5-minute, 30-minute, 1-hour and daily OHLCV bars from 2008-02-25 to 2026-10-30 (4,704 daily bars), continuous contract, ratio-adjusted at each roll, as one Parquet file per trading day.

NG is among the most volatile liquid futures; its seasonality makes it a classic subject for calendar and weather-driven backtests.

NG at a glance

Sample: NG 30-minute bars on 2026-10-30

The first regular-session bars from the newest 30-minute file, read live from the archive. Prices are the values as published; the full session has many more rows.

Open the full 2026-10-30 preview for NG

Corporate actions in the changelog

NG is a continuous contract: each roll is ratio-adjusted by the data source so percentage returns stay continuous across expiries. There are no splits to record; the continuous futures page explains the roll method, the published roll table and the current re-base status of older history.

Load NG in Python

Files are partitioned by trading day, so pulling one symbol means filtering across files. DuckDB reads the whole daily history in one statement; union_by_name and the COALESCE cover the older daily files, which carry a timestamp column where newer ones carry date:

  import duckdb

  ng = duckdb.sql("""
      SELECT COALESCE(date, CAST(timestamp AS DATE)) AS date,
             open, high, low, close, volume
      FROM read_parquet('by_date/futures_daily/*/*.parquet', union_by_name=true)
      WHERE symbol = 'NG'
      ORDER BY 1
  """).df()

Intraday files all share one schema, so Polars can scan a year of 5-minute bars lazily and keep only NG:

  import polars as pl

  bars = (
      pl.scan_parquet("by_date/futures_5min/2025/*.parquet")
        .filter(pl.col("symbol") == "NG")
        .select(["timestamp", "open", "high", "low", "close", "volume"])
        .sort("timestamp")
        .collect()
  )

Timestamps are US/Eastern bar open times. The Polars guide, the DuckDB guide and the backtrader guide take it from here: multi-year loads, resampling and feeding a backtest engine.

Available Futures files

Every file holds all Futures symbols for that day, NG included.

Get NG data

Free: a free account can download roughly the last year of daily Futures files, which include NG, from the daily browse page or by API key; a free intraday sample pack shows the intraday format. Complete Archive: every timeframe and the full history back to 2008-02-25 for NG and every other symbol, $79 one-time.

FAQ

Is NG history split-adjusted?

Futures do not split. NG is a continuous, ratio-adjusted series: all history sits on one ratio-adjusted basis, rolls inside the trailing 30-day window are re-based nightly and recorded in the roll table (meta/futures_rolls.parquet) -- see data quality.

How far back does NG go?

The first NG bar in the archive is dated 2008-02-25 and the newest is 2026-10-30. New sessions are added the same night, typically by midnight ET.

What timezone are the intraday bars in?

US/Eastern. Regular hours are 9:30 AM to 4:00 PM ET; 1-minute files also carry pre-market from 4:00 AM and after-hours to 8:00 PM where trades occurred.

Can I download only NG?

Files are per day, not per symbol, so you download the daily or intraday files for the dates you need and filter on symbol == "NG". A year of daily files is small; the snippets above do the filtering in one pass.

Related

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