Frost history / Rio Grande City, TX
Rio Grande City, TX: frost dates by year
Last spring and first fall frost at NOAA station USC00417622, 1951 to 2025, measured from daily minimum temperatures.
Elevation 172 ft, 26.377, -98.812. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 15 | Dec 4 |
| Earliest | Jan 5 (2019) | Oct 31 (1993) |
| Latest | Apr 2 (1987) | Dec 25 (2014) |
| Trend | 4.6 days earlier per decade | 2.2 days later per decade |
| Years with data | 65, 9 with no freeze | 65, 16 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 5 and the median first fall date is Dec 4.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Jan 22 | none | Jan 22 | none |
| 2024 | Jan 18 | none | Jan 18 | none |
| 2023 | none | none | none | none |
| 2022 | Mar 1 | Dec 23 | Feb 6 | none |
| 2021 | Feb 21 | none | Feb 20 | none |
| 2020 | Feb 28 | no data | none | no data |
| 2019 | Jan 5 | Dec 18 | none | none |
| 2018 | Jan 19 | Nov 14 | Jan 5 | Nov 14 |
| 2017 | Jan 8 | no data | Jan 8 | no data |
| 2016 | Feb 8 | none | none | none |
| 2015 | Jan 24 | no data | none | no data |
| 2014 | no data | Dec 25 | no data | none |
| 2011 | Feb 11 | Nov 28 | Feb 11 | none |
| 2010 | Jan 11 | Dec 1 | Jan 11 | none |
| 2009 | none | Dec 4 | none | Dec 4 |
| 2008 | Jan 19 | Dec 10 | none | none |
| 2007 | Mar 5 | Dec 15 | none | none |
| 2006 | Feb 13 | Dec 25 | none | none |
| 2005 | none | none | none | none |
| 2004 | none | Dec 14 | none | Dec 24 |
| 2003 | none | Dec 17 | none | none |
| 2002 | Jan 7 | none | Jan 7 | none |
| 2001 | Jan 21 | no data | Jan 21 | no data |
| 2000 | Jan 6 | Dec 19 | none | none |
| 1999 | no data | Dec 6 | no data | none |
| 1997 | no data | Dec 13 | no data | Dec 14 |
| 1996 | Mar 27 | Dec 18 | Feb 4 | Dec 18 |
| 1995 | Feb 1 | none | none | none |
| 1994 | Feb 2 | none | none | none |
| 1993 | Jan 26 | Oct 31 | none | Nov 28 |
| 1992 | none | Nov 27 | none | Nov 28 |
| 1989 | Mar 8 | Dec 13 | none | Dec 13 |
| 1988 | Feb 13 | none | none | none |
| 1987 | Apr 2 | none | Apr 1 | none |
| 1986 | Feb 24 | Nov 29 | Jan 28 | none |
| 1985 | Feb 13 | Dec 6 | Feb 12 | Dec 14 |
| 1984 | Jan 20 | Nov 28 | none | none |
| 1983 | no data | Dec 24 | no data | Dec 24 |
| 1982 | Mar 8 | none | Jan 18 | none |
| 1981 | Feb 12 | no data | none | no data |
| 1980 | Mar 4 | Nov 19 | none | none |
| 1979 | Feb 27 | Nov 30 | Jan 4 | Nov 30 |
| 1978 | Mar 6 | Dec 10 | Feb 23 | Dec 10 |
| 1977 | Feb 17 | Nov 10 | Jan 20 | Dec 22 |
| 1976 | Feb 25 | Nov 30 | Feb 24 | Dec 3 |
| 1975 | no data | Nov 14 | no data | none |
| 1974 | Feb 27 | Nov 26 | Feb 27 | Nov 26 |
| 1973 | Feb 12 | Nov 29 | Feb 11 | Dec 21 |
| 1972 | Feb 5 | Dec 16 | Feb 5 | none |
| 1971 | Mar 5 | none | Mar 5 | none |
| 1970 | Feb 18 | Nov 5 | Feb 4 | Nov 16 |
| 1969 | Mar 27 | Nov 20 | Jan 6 | Nov 20 |
| 1968 | Mar 24 | Nov 12 | Mar 14 | Dec 4 |
| 1967 | Feb 14 | Dec 11 | Feb 14 | Dec 23 |
| 1966 | Mar 6 | Nov 28 | Jan 31 | Nov 29 |
| 1965 | Mar 7 | none | Mar 6 | none |
| 1964 | Feb 23 | Dec 15 | Feb 8 | Dec 15 |
| 1963 | Feb 15 | Nov 30 | Feb 15 | Nov 30 |
| 1962 | Mar 3 | none | Jan 29 | none |
| 1961 | Feb 26 | Dec 24 | Feb 8 | none |
| 1960 | Feb 27 | Dec 22 | Feb 25 | none |
| 1959 | Jan 23 | Nov 7 | none | Nov 29 |
| 1958 | Feb 14 | Dec 16 | Feb 14 | Dec 16 |
| 1957 | none | Dec 1 | none | Dec 1 |
| 1956 | Feb 12 | Nov 27 | Jan 14 | Nov 30 |
| 1955 | Feb 13 | none | Feb 13 | none |
| 1954 | none | Dec 19 | none | none |
| 1953 | none | Nov 12 | none | Dec 25 |
| 1952 | Feb 28 | Dec 7 | none | none |
| 1951 | Mar 14 | Nov 4 | Feb 4 | none |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.