- Go to the Spring Planting Calendar setup by Skippy's Vegetable Garden
- Enter the date 04/21/2009 as the "Last Spring Frost" date for Brooklyn.
- Click the [Generate ...] button.
- See how late you already are!
This product contains station freeze/frost probability tables for each state. Given are the dates of probable first and last occurrence ... and the probability of experiencing a given temperature, or less ... probabilities are given for three temperatures (36, 32, and 28 °f) at three probability levels (10, 50, and 90 percent).The chart for New York state [PDF] lists four stations in New York City, including one on Avenue V in Brooklyn. Let's look at the Spring-relevant subsection of the New York state table for NOAA's Brooklyn station:
To get the "last frost date" for Brooklyn, I chose the most conservative - the safest - values: the highest of the three temperatures, 36F, and the 10% probability threshold. The date given is April 21. That means that there's only a 10% chance that the temperature will drop to 36F or lower on or after April 21, so that's the date I used for "Last Spring Frost" in the Spring Planting Calendar.
LinksSpring Planting Calendar
Skippy's Vegetable Garden
NOAA charts of frost and freeze dates