29 C.F.R. § 500.30
(b) Small business exemption. Any person, other than a farm labor contractor, for whom the man-days exemption for agricultural labor provided under section 13(a)(6)(A) of the Fair Labor Standards Act of 1938 (29 U.S.C. 213(a)(6)(A)) is applicable. That exemption applies to an agricultural employer who did not, during any calendar quarter of the preceding calendar year, use more man-days of agricultural labor than the limit specified under that statute.
(f) Local short-term contracting activity. Any person who engages in any farm labor contracting activity solely within a twenty-five mile intrastate radius of such person's permanent place of residence and for not more than thirteen weeks per year.
(2) For not more than thirteen weeks per year as used in section 4(a)(3)(D) of the Act means that farm labor contracting activities may not be engaged in for more than thirteen weeks in a year. This does not mean, however,
that persons who engage in intrastate and short-range farm labor contracting activities are exempt for the first thirteen weeks of their farm labor contracting activities each year. The number of weeks of contracting activity during the prior year is also a factor. When the limit of weeks for the exemption is exceeded in a calendar year, the person is subject immediately to the Act and is also presumed subject to the Act in the next calendar year, unless it can be shown that the tests of section 4(a)(3)(D) are met.
(i) Seed production exemption.
(j) Shade grown tobacco.