Frost dates for Weldon Spring NWS, Missouri
Half of years have their last spring frost by April 10, but 1 year in 10 still frosts after April 26.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- April 26
- 1 year in 5
- April 20
- 3 years in 10
- April 16
- 2 years in 5
- April 13
- Half of years (the median)
- April 10
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 12
- 1 year in 5
- October 17
- 3 years in 10
- October 20
- 2 years in 5
- October 23
- Half of years (the median)
- October 26
- Growing season
- about 199 days
- Hardiness zones nearby
- 6b, 7a
- Summer days
- a usual high of about 30 °C86 °F
- Lettuce and spinach run to seed
- May to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~4 °C39 °F · low ~-6 °C21 °F · rain ~66 mm2.6 in
- February
- high ~7 °C45 °F · low ~-4 °C24 °F · rain ~62 mm2.4 in
- March
- high ~13 °C55 °F · low ~1 °C33 °F · rain ~95 mm3.7 in
- April
- high ~19 °C67 °F · low ~7 °C44 °F · rain ~119 mm4.7 in
- May
- high ~24 °C76 °F · low ~12 °C54 °F · rain ~129 mm5.1 in
- June
- high ~29 °C84 °F · low ~17 °C63 °F · rain ~120 mm4.7 in
- July
- high ~31 °C87 °F · low ~20 °C67 °F · rain ~100 mm3.9 in
- August
- high ~30 °C87 °F · low ~19 °C65 °F · rain ~91 mm3.6 in
- September
- high ~27 °C80 °F · low ~14 °C57 °F · rain ~89 mm3.5 in
- October
- high ~20 °C68 °F · low ~8 °C46 °F · rain ~86 mm3.4 in
- November
- high ~13 °C55 °F · low ~2 °C35 °F · rain ~94 mm3.7 in
- December
- high ~7 °C44 °F · low ~-3 °C26 °F · rain ~78 mm3.1 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Weldon Spring NWS station (listed by NOAA as Weldon Spring NWS, USC00238805), at 38.70, -90.68. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
62036, 63005, 63011, 63017, 63021, 63025, 63038, 63040, 63043, 63045, 63049, 63073…
+10 moreShow fewer
63146, 63301, 63303, 63304, 63341, 63366, 63367, 63368, 63376, 63385.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- St Louis Sci Center, MO, last frost by April 1
- Festus, MO, last frost by April 9
- Belleville SIU Rsch, IL, last frost by April 12
- Carlinville, IL, last frost by April 14
- Hillsboro, IL, last frost by April 13
- Springfield #2, IL, last frost by April 15
Other stations in Missouri.
- Pleasant Hill, MO, last frost by April 8
- Kansas City Downtown Airport, MO, last frost by April 4
When do I plant? · Where the dates come from
More ways Milpa can help
When do I plant? · What grows well together? · Plan my garden · What can I plant now? · Something wrong in the garden? · Keep a garden diary · Heard a tip?