Last and first frost dates in St. Petersburg

When is the last frost in St. Petersburg?

The last frost in St. Petersburg usually comes around 18 January: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 28 December, while corn waits until 25 January.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in St. Petersburg

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).

Frost dates near St. Petersburg

Of the nearest cities on our list, the last spring frost ends earliest in Tampa (18 January) and latest in Jacksonville (23 January).

Seeds, seedlings and markets in St. Petersburg

Within 15 km of St. Petersburg OpenStreetMap lists 6 garden centres, 2 markets and 1 farm shop (collected 28 October 2026). The nearest garden centre to the city centre is Dolins Garden Center, 3 km away.

• Dolins Garden Center — garden centre
  62nd Avenue North 801, 33702 Saint Petersburg · Mon–Sat 08:30–17:30; Sun 10:00–17:00 · 3 km
• Baum Ave market — market
  Central Avenue 1113, 33705 Saint Petersburg · Mon–Sun 09:00–20:00 · 6 km · baumavemarket.com
• Corner Garden Produce — farm shop
  4th Avenue South 2300, 33712 Saint Petersburg · Tue–Sat 10:00–19:00 · 6 km
• Garden Center (The Home Depot) — garden centre
  Mon–Sat 06:00–22:00; Sun 08:00–20:00 · 3 km
• Saint Petersburg Saturday Morning Market — market
  Sat 09:00–14:00 · 7 km · saturdaymorningmarket.com
• Palm Trees Direct — garden centre
  Bay Pines Boulevard 8440 · 9 km

• Where to buy seeds and seedlings in St. Petersburg
• Selling your own harvest in the United States

Places: © OpenStreetMap contributors, ODbL.

Weather in St. Petersburg by month

Average weather in St. Petersburg over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: January–December (20–31.3 °C). Months that average 30 °C or more by day: June–September (30.4–31.3 °C). No month averages below 0 °C at night; the coldest nights, in January, average 12.7 °C. About 1244 mm of rain falls in a year, on 148 days; August is the wettest month (218 mm) and March the driest (47 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).