Frost dates for Conroe Montgomery County Airport, Texas
Half of years have their last spring frost by March 11, but 1 year in 10 still frosts after April 3.
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 3
- 1 year in 5
- March 27
- 3 years in 10
- March 21
- 2 years in 5
- March 15
- Half of years (the median)
- March 11
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- November 1
- 1 year in 5
- November 5
- 3 years in 10
- November 10
- 2 years in 5
- November 14
- Half of years (the median)
- November 19
- Growing season
- about 253 days
- Hardiness zone nearby
- 9a
- Summer days
- a usual high of about 34 °C93 °F
- Lettuce and spinach run to seed
- April 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.
- Hot-weather watering
- July to August: days run above 32 °C90 °F and nights stay above 21 °C70 °F, so expect to water daily or every other day (how we know)
Month by month
- January
- high ~17 °C62 °F · low ~4 °C39 °F · rain ~108 mm4.2 in
- February
- high ~19 °C66 °F · low ~6 °C43 °F · rain ~75 mm2.9 in
- March
- high ~23 °C73 °F · low ~9 °C49 °F · rain ~76 mm3 in
- April
- high ~26 °C79 °F · low ~13 °C55 °F · rain ~79 mm3.1 in
- May
- high ~30 °C86 °F · low ~18 °C64 °F · rain ~122 mm4.8 in
- June
- high ~33 °C91 °F · low ~21 °C70 °F · rain ~112 mm4.4 in
- July
- high ~34 °C94 °F · low ~22 °C72 °F · rain ~80 mm3.1 in
- August
- high ~35 °C94 °F · low ~22 °C72 °F · rain ~98 mm3.9 in
- September
- high ~32 °C90 °F · low ~19 °C66 °F · rain ~91 mm3.6 in
- October
- high ~28 °C82 °F · low ~14 °C56 °F · rain ~140 mm5.5 in
- November
- high ~22 °C71 °F · low ~8 °C47 °F · rain ~130 mm5.1 in
- December
- high ~18 °C64 °F · low ~5 °C41 °F · rain ~99 mm3.9 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Conroe Montgomery County Airport station (listed by NOAA as Conroe Montgomery Co Ap, USW00053902), at 30.36, -95.41. 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
77302, 77303, 77306, 77358, 77378.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Houston-Port, TX, last frost by February 2
- Houston Sugarland Mem, TX, last frost by February 2
- Thompsons 3 WSW, TX, last frost by February 15
Other stations in Texas.
- Austin 6 S, TX, last frost by March 10
- New Braunfels, TX, last frost by March 8
- Dallas Redbird Airport, TX, last frost by March 6
- Dallas Love Field, TX, last frost by March 2
- Fort Worth, TX, last frost by March 10
- Denton Municipal Airport, TX, last frost by March 24
When do I plant? · Where the dates come from
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