Frost Dates for Black Jack, MO
Based on data from St Louis Lambert Intl AP weather station, 6 miles away
Elevation: 600 ft
Frost Dates
Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide.
April 2
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date.
November 4
30% Probability
Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost
April 7
First Fall Frost
October 30
Hard Freeze (28°F)
Last Spring Hard Freeze
March 23
First Fall Hard Freeze
November 13
Growing Season
216 Days
April 2 to November 4
USDA Hardiness Zone
Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.Zone 7a
Avg. annual minimum: 0 to 5°F
Köppen Climate
The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfa
Hot-Summer Continental
Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.
Temperature
20°
40°
60°
80°
Avg High
Avg Temp
Avg Low
Light Frost (32°F)
Hard Frost (28°F)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 40° | 32° | 24° |
| February | 46° | 37° | 28° |
| March | 57° | 47° | 37° |
| April | 68° | 58° | 47° |
| May | 77° | 68° | 58° |
| June | 86° | 77° | 67° |
| July | 90° | 80° | 71° |
| August | 88° | 79° | 69° |
| September | 81° | 71° | 61° |
| October | 69° | 59° | 49° |
| November | 56° | 46° | 37° |
| December | 45° | 37° | 29° |
Precipitation
0"
2"
4"
6"
7.1"
Precipitation table
| Month | Precipitation |
|---|---|
| January | 3.2 |
| February | 3.4 |
| March | 5.3 |
| April | 6.2 |
| May | 6.2 |
| June | 7.1 |
| July | 6.8 |
| August | 6.0 |
| September | 5.7 |
| October | 5.8 |
| November | 5.0 |
| December | 4.3 |
Sunrise / Sunset
Daylight
Central Time (CT)
Longest: 14h 43m · Shortest: 9h 17m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:24 AM | 4:58 PM | 9h 34m |
| February | 6:60 AM | 5:32 PM | 10h 33m |
| March | 7:20 AM | 7:02 PM | 11h 42m |
| April | 6:31 AM | 7:32 PM | 13h 01m |
| May | 5:54 AM | 8:01 PM | 14h 07m |
| June | 5:41 AM | 8:23 PM | 14h 42m |
| July | 5:53 AM | 8:21 PM | 14h 28m |
| August | 6:20 AM | 7:51 PM | 13h 31m |
| September | 6:49 AM | 7:03 PM | 12h 14m |
| October | 7:18 AM | 6:15 PM | 10h 58m |
| November | 6:51 AM | 4:42 PM | 9h 51m |
| December | 7:18 AM | 4:36 PM | 9h 18m |
Nearby Stations
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