open_by_zone
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-09-24, from us-stock-market-hours-mountain-time.
| month | denver_open | phoenix_open_earliest | phoenix_open_latest | denver_gap_hours | phoenix_gap_hours |
|---|---|---|---|---|---|
| 2025-08 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2025-09 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2025-10 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2025-11 | 07:30 | 07:30 | 07:30 | 2 | 2 |
| 2025-12 | 07:30 | 07:30 | 07:30 | 2 | 2 |
| 2026-01 | 07:30 | 07:30 | 07:30 | 2 | 2 |
| 2026-02 | 07:30 | 07:30 | 07:30 | 2 | 2 |
| 2026-03 | 07:30 | 06:30 | 07:30 | 2 | 2.77 |
| 2026-04 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2026-05 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2026-06 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2026-07 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2026-08 | 07:30 | 06:30 | 06:30 | 2 | 3 |
| 2026-09 | 07:30 | 06:30 | 06:30 | 2 | 3 |
- Rows × columns
- 14 × 6
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
month |
text | 14 distinct values (2025-08, 2025-09, 2025-10…) | |
denver_open |
text | 1 distinct value (07:30) | |
phoenix_open_earliest |
text | 2 distinct values (06:30, 07:30) | |
phoenix_open_latest |
text | 2 distinct values (06:30, 07:30) | |
denver_gap_hours |
number | every row is 2 | |
phoenix_gap_hours |
number | 2 to 3 |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
WITH session_opens AS
(
SELECT
toDate(toTimeZone(window_start, 'America/New_York')) AS session_date,
min(window_start) AS open_utc
FROM global_markets.delayed_stocks_minute_aggs
WHERE ticker = 'SPY'
AND window_start >= today() - 400
AND window_start < today() - 2
AND toHour(toTimeZone(window_start, 'America/New_York')) = 9
AND toMinute(toTimeZone(window_start, 'America/New_York')) = 30
GROUP BY session_date
)
SELECT
formatDateTime(toStartOfMonth(session_date), '%Y-%m') AS month,
min(formatDateTime(toTimeZone(open_utc, 'America/Denver'), '%H:%i')) AS denver_open,
min(formatDateTime(toTimeZone(open_utc, 'America/Phoenix'), '%H:%i')) AS phoenix_open_earliest,
max(formatDateTime(toTimeZone(open_utc, 'America/Phoenix'), '%H:%i')) AS phoenix_open_latest,
round(avg(toHour(toTimeZone(open_utc, 'America/New_York'))
- toHour(toTimeZone(open_utc, 'America/Denver'))), 2) AS denver_gap_hours,
round(avg(toHour(toTimeZone(open_utc, 'America/New_York'))
- toHour(toTimeZone(open_utc, 'America/Phoenix'))), 2) AS phoenix_gap_hours
FROM session_opens
GROUP BY month
ORDER BY month
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